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male marijuana seed

Male marijuana seed
Indica, Sativa, Ruderalis, Oh My!

Which Medical Marijuana Strains Are Right For Me?

Would you like to find the perfect strain for your symptoms?

If so, you’re going to love this article which reveals everything you need to know to make the right choice.

Now before I get started, I know many of you will be asking me where you can get seeds for these strains.

If you know someone who is already growing any of these strains, it’s easy. Just ask them for seeds or clones.

For the rest of us…

First, let me introduce you to the main things you need to know about strains (when buying seeds online for your particular symptoms)

Indica, Sativa, Ruderalis, Oh My!

According to Wikipedia, “Cannabis sativa is an annual herbaceous plant in the Cannabaceae family.”

Sidenote: All “strains” of marijuana, including hemp, are sometimes technically still considered varieties of the plant “Cannabis Sativa.” Scientifically, these are not different “strains” of marijuana as much as they are “varieties” of the plant Cannabis Sativa. This is confusing sometimes because people will talk about “Sativa” varieties of Cannabis Sativa as well as “Indica” varieties of Cannabis Sativa. This isn’t important to the grower, but sometimes you’ll run into someone who argues about the proper language and understanding the distinction between what science says and what growers say will help you.

In the common language, we have differentiated the different varieties or “strains” of marijuana because each one grows differently, contains different cannabinoid profiles, and has different effects on people.

These facts are what’s most important to the grower.

The Indica variety of marijuana tends to grow short and bushy, with wide/fat leaves. The buds produced by Indica plants tend to cause a more heavy and relaxing effect, known as a “body high”, and can cause people to feel “couchlocked.”

Indica plants tend to be well-suited to grow indoors because of their shape and Indica buds are especially suited to relieve insomnia, muscle tension, nausea, lack of appetite, anxiety, body pain, and depression.

The Sativa variety of marijuana tends to grow tall and lanky, with thin, fingerlike leaves. Sativas also generally have a longer flowering period and grow buds that are more airy and less dense than from an Indica.

The buds from a Sativa plant cause more of an “in your head” high, sometimes psychedelic, sparking creativity, uplifting your mood, and even can be energizing for some people.

Sativa varieties of marijuana are often better suited to growing outdoors as they can grow to 20 feet or more in height. While an indoor grower can use growth control methods to control the height and shape of the plant, a full Sativa can be tough for an indoor grower with limited space.

Therefore, many indoor growers who love the Sativa effects will opt for a hybrid that carries the same bud properties, but has been bred to be easier for indoor growing.

Well-loved by artists, Sativas are especially suited to relieve depression, migraines and certain types of pain, while being more “day-friendly” and energizing than many pure Indicas.

Two Aurora Indica plants on left (very small, fast-flowering Indica) & two Wonder Woman plants on right (a hybrid with some Sativa characteristics) – Grown together from seed in the same environment, but there are stark differences between the strains! In addition to the dramatic size difference, the Aurora Indica plants are ready to harvest, while the two Wonder Woman plants still have weeks left!

The Haze variety of marijuana is often considered a type of Sativa, or at least Sativa-dominant, yet Hazes have a few unique properties all their own. The genetics of this strain combine Sativas originally from Mexico, Colombia, Thailand and India.

Hazes tend to have psychedelic and uplifting effects, and Haze plants have contributed genetics to many famous strains such as Super Lemon Haze, Northern Lights, and Jack Herer. Hazes tend to have very long flowering periods, though stay shorter and are easier to grow indoors than a pure Sativa.

The Ruderalis variety of marijuana that was once known as ‘ditchweed.’ With no psychoactive properties on its own, pure Ruderalis plants have been mixed with other strains because of one unique property… Unlike most strains of marijuana, Ruderalis or Auto-Flowering strains will naturally go into flowering on their own, without the need for the 12-12 light change to let the plant “know” it’s time to start flowering.

Basically, a Ruderalis plant will go through its whole lifecycle in about 3 months, regardless of what you do as a grower. This can be bad if you’d like to harvest big yields but can be convenient since traditional Ruderalis plants tend to stay very short and are well-suited to small, indoor spaces.

The best modern auto-flowering strains have been bred to produce bigger and denser buds than the original Ruderalis plants. Buds have also been bred to be as potent as photoperiod strains.

A hybrid strain is any combination of the cannabis varieties listed above. Hybrids make up the majority (if not all) of the strains you’ll encounter or buy in this day and age.

A Note About Ruderalis/Auto-Flowering Plants and CBD

Ruderalis strains used to tend to be less “potent” (with THC) compared to other strains of marijuana since original Ruderalis plants had basically zero THC. In recent times, many strains have been developed that have nearly comparable THC levels, which maintaining the auto-flowering characteristics of Ruderalis.

In my experience, the buds are very comparable to photoperiod strains. For example, an auto-flowering version of White Widow would produce basically the same buds as a photoperiod version of White Widow (at least as long as you’re using a trust-worthy auto-flowering breeder).

Another unique property of Ruderalis strains is, like hemp, these strains sometimes tend to have higher levels of CBD which have many implications for medical uses such as anti-anxiety. I personally have found that the one difference with auto-flowering strains is they tend to be a little more relaxing.

Learn About the Main Cannabis Life Stages…

The tips and advice in this article are only meant to be used by those who can legally grow marijuana according to all applicable laws. We do not in any way recommend that you use this information if it is not legal for you to do so. Please do not proceed to read any of the following information if you are committing a crime by following the steps outlined in this article, even when growing for pain relief, medical research, or any other reasonable purpose.

Choose The Perfect Strain For Your Symptoms

All right, now that you’ve got the basics, let’s look at specific strains for…

Reduce Anxiety

  • Mazar
  • Romulan
  • LA Confidential
  • Northern Light
  • Cheese (has a slightly odd smell, but is specifically known for relaxing effects)
  • Cheese Auto CBD – Learn more about auto-flowering strains and/or CBD

Increase Appetite / Relieve Nausea

  • Sour Diesel (be careful as this one can have too strong mental effects for some people)
  • Super Lemon Haze
  • Mazar
  • Afgoo

Uplifting / Relieves Depression

Helps You Get To Sleep / Relieves Insomnia

Reduces Pain

Better for During the Day

Where do I get seeds?

You have 2 real options:

  • Use random bagseed that you find
  • Buy seeds of specific strains online

Now I love experimenting as much as the next person, and even after 8 years of growing marijuana, I still occasionally grow “found” seeds.

But even though I’ve grown found seeds from the dankest of dank buds, I’ve still always had the best results when growing from specific strains that I already know something about beforehand.

Often the effects of random seeds are wildly different from the “parent” you found them in. Either that or you don’t know what growing conditions are needed to produce the effects you desire.

Because of this added random factor, I highly recommend choosing a strain that fits your specific needs, especially if you’re looking for seeds with certain effects (for example to treat a certain symptom like pain, nausea, or anxiety).

Another good reason to choose a specific strain is if you are looking for compatible growing patterns, for example you can choose to grow strains that are especially quick-to-harvest or particularly easy to grow.

Note: “Feminized” seeds means that the seeds have been particularly bred to product all-female plants. Regular seeds will end up being about half male and half female. Female plants produce buds, while male plants are usually thrown away.

Top 5 Strains For New Growers

Ak-48

Sometimes confused with Ak-47, Ak-48 emerges victorious from this battle between similarly named strains for being easier to grow, and for providing an incredibly social high.

Genetics: Jock Horror x Ice (Afghani, Skunk, Northern Lights and Shiva)

Effects: Though this strain is a hybrid, the effects tend to be more like a Sativa. Relieves stress and anxiety for many people, though does have higher reports of dry mouth. More uplifting and energizing than many strains.

Growing Conditions: Grows great indoors or outdoors, in soil or hydro. Reacts well to growth control methods like being topped and has resistance to root problems. However, does not like high temps and doesn’t do well above 85 °F (30 °C). Strong, pleasant sweet odor starts ramping up towards the end of the flowering stage as harvest time approaches.

Yields: Above average.

Nebula’s Thoughts: My favorite strain for going out. You really can’t ask for more from a strain, Ak-48 is potent and remarkably easy to grow. Buds taste great and smell slightly sweet, spicy or fruity.

An anonymous reviewer described this strain best: “I feel like I could work out… but I’m definitely sufficiently baked. Like, severely baked.”

Northern Light

Genetics: Legendary Strain of Unknown Origins (Leans toward Indica)

Effects: Euphoric, a great “enhancer” for other activities, and often used to relax or relieve stress. Does cause higher levels of dry mouth compared to other strains.

Growing Conditions: Hardy, tends to stay short and quick to harvest (usually ready to harvest after only 2 months of flowering). Dense buds don’t usually give off a strong odor and the plant reacts well to low stress training and other growth control techniques. These traits makes this strain especially suited to indoor and/or stealth growing, though many have reported great results growing outdoors.

Yields: Average to Above Average. Considering that plants tend to stay short, she grows above average yields.

Nebula’s Thoughts: Easy to grow, potent, and quick finishing, though not known particularly for flavor (she’s not quite odorless). I often recommend this strain for people’s first grow, as Northern Lights plants stay short, don’t smell a lot, and are especially forgiving.

Aurora Indica

Genetics: F1 (first generation) hybrid of Afghan x Northern Lights

Effects: “Stoney,” couchlock, ultra potent indica. Great for treating nausea. High THC levels, tested at 19.7% from last batch.

Growing Conditions: First generation hybrids often tend to be tough and resistant to problems, and Aurora Indica is no exception. Easy to train, she can handle higher temperatures and still thrive. Stays on the short side, though there are some reports that occasionally a seed of this strain grows more tall and leggy, like a sativa, and needs to be trained stay short (though the buds produced are still amazing). Quick 7-9 week flowering period then she’s ready for harvest. Heavy odor, especially as harvest approaches.

Yields: Big yields with fat colas.

Nebula’s Thoughts: Currently one of my favorite strains. Easy to grow & train, high-yielding and POTENT.

Anonymous said it best with, “Remember to wear ear plugs so your brains don’t leak out.”

Jack Herer

Jack Herer and Jock Horror are two similarly named strains with similar genetics and effects. However, Jack Herer is the original, and almost everyone agrees that it’s better.

Genetics: Unknown, though we speculate haze, sativa, and indica

Effects: Euphoric, uplifting and creative. The effects of the buds are somewhat like a haze strain. Relieves stress or anxiety, but also used to provide relief for pain, headaches and muscle spasms.

Growing Conditions: Medium to tall height, she’ll double in height or more after she begins the flowering stage unless you use growth control methods to keep her short. Despite the haze genetics, this strain actually finishes relatively quickly, I’ve had best results harvesting 2.5 months into flowering. Buds tend to grow with “foxtails” which give the buds a unique appearance. Does best indoors, though can be grown outdoors in a sunny, mediterranean climate over a long summer. She’s not super picky, but she does need for you to pay close attention to her needs, and cannot stand too-hot temperatures.

Nebula’s Thoughts: Jack Herer has probably won more awards than any other strain. The buds literally strike down on anxiety like a hammer, so you can just get on with your life. Clean, refreshing high and unique spicy, almost peppery taste/smell. Not the easiest to grow, yet the buds are incredible and totally worth a little extra trouble for the marijuana connoisseur.

Sensi seeds said it best with “Smokers should be prepared to feel the earth shake beneath their feet – which can be a very pleasant feeling when your head is firmly in the clouds.”

Super Lemon Haze

Genetics: Lemon Skunk x Super Silver Haze

Effects: Surprisingly strong, energetic and creative, perfect for daytime use. Doesn’t usually cause ‘couchlock’. You may want to avoid this strain if you’ve experienced anxiety or paranoia in the past, as the effects come on fast and hit you like a ton of bricks. Tends to cause dry eyes/dry mouth.

Growing Conditions: Needs 2.5-3.5 months in the flowering stage, and can get tall, growing in a Christmas tree shape, unless you top or FIM her (she responds well to growth control methods).

Yields: Very, very high yields

Nebula’s Thoughts: 2008 High Times Cannabis Cup winner (by a landslide). I have a soft spot for hazes and this one tastes like a lemonhead. The effects are strong yet clear-headed. I often choose this strain when I’m working or have a lot to get done. It doesn’t weigh you down yet makes everything seem just a little bit more awesome.

According to Greenhouse Seeds, “The THC is high at over 22%, ensuring a very psychedelic experience to even the most experienced smokers.”

About the Author: Nebula Haze

In response to the need for more tutorials aimed at new growers, Nebula co-founded GrowWeedEasy.com in 2010 with fellow grower Sirius Fourside.

Since then, Nebula has published dozens of growing articles in print and online, stars in several online video lessons, and continues to dedicate herself to serving the needs of the medical marijuana growing community.

“My mission is to show other medical marijuana patients how easy and fun it can be to grow pounds of killer weed out of your closet.”

Check It Out!

At GrowWeedEasy.com, we recently decided to re-evaluate all the top cannabis seed banks based on customer service, reliability, and longevity.

We came to the conclusion that there are 3 clear winners as far as who to get seeds from. These seedbanks have legendary customer service, and will gladly answer all your questions about your seed orders. If you ever have a problem with any order, I highly recommend contacting the seedbank right away as they will quickly take care of you.

Male marijuana seed
3.) Harvest “Feminized” Pollen – When pollen sacs are ready to be harvested they swell like a balloon and start to open up. Make sure not to harvest early and also make sure to keep spraying the bud sites daily until this point or you might end up with empty pollen sacs! When the pollen sacs are ready, the leaf section protecting the pollen will start to crack. At this point, it’s time to collect the feminized pollen. One of the easiest ways to do this is to collect the pollen sacs directly and let them dry for a week. At that point, they can be placed in a bag and shaken to easily collect all the pollen.

How to Make Feminized Seeds at Home

by Nebula Haze (originally inspired in part by this thread from PhenoMenal)

Table of Contents

5 Steps to Feminized Seeds – Learn how to force female plants to make pollen and create feminized seeds

Introduction to Feminizing Your Own Cannabis Seeds

First of all, what are “feminized” marijuana seeds? Feminized seeds are seeds which have been created by breeding two female plants together. Because there are no male parents, all the resulting seeds end up being bud-bearing female plants. With feminized seeds, you know you can always count on every plant to produce buds, and don’t have to worry about removing male plants (which cause lower yields and seedy buds if they’re left among your female plants). Learn more about male vs female cannabis plants.

Feminized seeds come from two female plants being bred together, causing all offspring to be female

Feminized seeds are commonly available from seed banks for nearly every popular or famous strain. Breeders understand that a lot of people just want to grow plants for buds, and don’t care about making a robust breeding program (which is one of the main reasons growers want male plants).

So how do seed banks feminize their seeds? How can you breed two female plants together?

The main idea is to force a female plant to produce pollen sacs like a male plant. These male flowers (growing on a female plant) create pollen, which can be harvested and used to pollinate another female cannabis plant. The resulting seeds will all end up being female. Can feminizing seeds cause hermaphrodite plants?

Growers can force a female plant to make pollen sacs, and the “feminized” pollen produced can be used to fertilize another female plant

How do you force a female plant to make pollen?

There are two main ways to make feminized pollen:

  1. Induce feminized pollen chemically (Recommended) – This is the “professional way” to feminize seeds, and is how most reputable seed banks and breeders create feminized seeds to sell to the public. Substances such as colloidal silver and gibberellic acid are used because they cause a female plant to produce male pollen sacs if bud sites are drenched daily for the first 3-4 weeks after the switch to 12/12. This article will give you step-by-step instructions on how to feminize cannabis seeds using this method.
  2. Rhodelization (Not Recommended!) – In the wild, some female cannabis plants will naturally start making male pollen sacs or “bananas” which can self-pollinate the plant. This happens if the plant is stressed, or if the plant is not harvested in time and buds start to die of old age. The plant is basically doing everything it can to save the next generation. This method is “natural” and these seeds will all end up being mostly female, but the problem is you’re selecting for plants that naturally hermie (grow both male and female sex organs) without any chemical induction. This means the resulting seeds are much more likely to turn hermie in natural conditions too. That’s a problem if you don’t want seedy buds every time you harvest. For that reason, it’s highly recommended you don’t feminize seeds this way, and it’s a good idea to toss any and all seeds that are the result of natural herming.

Read this article for more in-depth discussion about the pros and cons of each method, and how to avoid hermaphrodite plants when producing your own feminized seeds.

Overview: How to Make Feminized Seeds

1.) Buy or Make Colloidal Silver – The article below will teach you how to make colloidal silver at home, as well as show you where to buy it if you don’t want to make it (it’s actually pretty cheap!). It’s basically a solution of silver suspended in water and is available online and in health stores as a dietary supplement.

What about gibberellic acid? I’ve seen with my own eyes that the colloidal silver method works for making feminized seeds, but I don’t personally know anyone who has tried making feminized seeds with gibberellic acid. From what I understand it can be used exactly the same way as colloidal silver to induce female plants to produce pollen, but I’m not sure exactly how to prepare a gibberellic acid solution that works consistently.

2.) Spray the bud sites of your known female plant daily during first 3-4 weeks of the flowering stage (until pollen sacs form and start splitting open) – After switching to a 12/12 light schedule, choose bud sites on your known female plant, and spray/drench them daily with colloidal silver (or gibberellic acid). As the treated flowers develop, they will form into male pollen sacs. Untreated bud sites on the plant will form into female buds as usual; however, these buds are unsafe to smoke unless you’ve been very careful to make sure they didn’t come into contact with colloidal silver or gibberellic acid during the feminization process.

3.) Harvest “Feminized” Pollen – When pollen sacs are ready to be harvested they swell like a balloon and start to open up. Make sure not to harvest early and also make sure to keep spraying the bud sites daily until this point or you might end up with empty pollen sacs! When the pollen sacs are ready, the leaf section protecting the pollen will start to crack. At this point, it’s time to collect the feminized pollen. One of the easiest ways to do this is to collect the pollen sacs directly and let them dry for a week. At that point, they can be placed in a bag and shaken to easily collect all the pollen.

4.) Pollinate Another Female Plant – At this point, take the feminized pollen you’ve collected and use it to pollinate a female plant that has been flowering for about 2-3 weeks (full detailed instructions with a video on how to do this below). Although it’s possible to pollinate the same plant as the original, it’s not recommended in part because the timing doesn’t match up (attempting to pollinate buds too late in the flowering stage leads to reduced seed production). It’s best to pollinate a different female plant that you started budding a few weeks after the original. This increases the number of seeds produced as well as gives the new female plant enough time to develop them to maturity. It also increases genetic diversity compared to self-pollination.

6 Weeks to Harvest Seeds – After about 6 weeks from pollination, the calyxes on the buds of your female plant will be swollen and fat. You know it’s time to harvest your seeds when they start bursting out. At this point, it’s time to congratulate yourself because you’ve got feminized seeds!

Now that you’ve gotten the overview, here’s the feminization process with detailed step-by-step instructions…

Step-By-Step Instructions (with pics!)

1.) Buy or Make Colloidal Silver (or Gibberellic Acid)

Where to get Colloidal Silver (your options):

    Buy Ready-To-Use Collo >

Note: You can purchase gibberellic acid online (a gibberellic acid solution can be used the same way as colloidal silver for feminizing seeds). However, I do not have experience with the gibberellic acid method and don’t know the best way to prepare the solution.

2.) Spray the bud sites of your known female plant daily during first 3-4 weeks of the flowering stage (until pollen sacs form and start splitting open)

When you’re ready, change to a 12/12 light schedule in order to initiate flower formation. For photoperiod plants, wait until your plant is 5-6 weeks old before initiating the flowering stage. Some young plants seem to have trouble (and take much longer) to go through the feminization process, and their pollen may not be as fertile, so start with a more mature plant.

As soon as you change the light schedule (and maybe even a day or two before) start spraying your plants thoroughly with colloidal silver at every bud site you want to form into pollen sacs.

Spray bud sites thoroughly, drenching them with colloidal silver every single day


The above pic shows you where pollen sacs form on the plant (same places female buds form)

Important! Keep spraying daily until pollen sacs open up. Don’t stop spraying early, even if pollen sacs appear to be already formed, otherwise they may not produce much pollen!

A one-hand pressure sprayer / mister is really helpful for spraying bud sites evenly and thoroughly

You can choose to treat a single bud site or all the bud sites on the plant. Any untreated bud sites will develop into female buds as usual. If you want to smoke these buds, it’s incredibly important to avoid letting them come into contact with colloidal silver as that’s not safe to smoke. (Don’t worry, feminized seeds don’t contain any silver). I highly recommend letting the whole plant be your test subject so you don’t have to worry about that ?

Note: If you’re feminizing an auto-flowering plant, start spraying daily when the plant is about 20 days old from seed. This is when most auto-flowering cannabis strains start making flowers.

3.) Harvest Your Feminized Pollen

When pollen sacs are starting to crack and look like they’re about to open up (or if you can see one has already opened) then your pollen is ready for harvest!

When pollen sacs are cracking and opening up, you’re ready to harvest your pollen!

Pollen spilling onto a nearby leaf

One way to harvest your pollen is to gently and carefully remove all the pollen sacs. Let them dry for a week, and then put them in a resealable bag. If you shake the bag the pollen should easily spill out. You may need to cut a few open yourself.

How to Store Feminized Pollen: Moisture is your main enemy when storing pollen. It can help to double the mass of the pollen collected by adding regular cooking flour. This absorbs moisture during storage and as an added bonus, it will make application easier when you get to pollinating. If you triple-bag the pollen-flour mixture and stick it in the freezer (with a good nametag so you know where the pollen came from), your pollen can be stored for a year or longer.

4.) Pollinate Another Female Plant

When your chosen mother is 2-3 weeks into the flowering stage, take a paintbrush and ‘paint’ your feminized pollen on the developing bud sites you want to pollinate. Bud sites (for both male and female plants) are located wherever you can see leaves meet a stem.

Only the buds that come in contact with pollen will grow seeds. You can choose to pollinate all of your buds or just a few on the plant.

Make sure that you’re touching all the female pistils/hairs with your pollen. Here’s a little video showing you exactly what this looks like!

6 Weeks to Harvest Seeds

It usually takes about 6 weeks for your feminized seeds to fully develop. Some plants are literally dying right as the seeds become ready, so to get the most viable seeds, you need to try to keep it alive until the seeds actually start dropping. The seeds can be used right away, or stored in a cool, dry place for a few years. Don’t forget to label them with the date!

This seed is about to burst out of its calyx!

This is what it looks like when the seed is exposed

Picture Journal of Making Feminized Pollen with Colloidal Silver

This grower initiated the feminization process on a seedling that was only a few weeks old. As a result, the plant wasn’t able to get big enough to produce many pollen sacs. You will get even better results if you start with a plant that is at least 5 weeks old ?

October 18 – Plant right before the switch to 12/12

October 27 – After being drenched with colloidal silver daily for a little over a week

October 30 – Pollen sacs are forming

November 15 – Pollen sacs appear to be almost fully formed and are swelling in size, but haven’t opened up yet. Don’t stop spraying colloidal silver or you may end up with empty sacs!

November 27 – Pollen sacs are opening up! Collect the pollen before they’re all open!

FAQs – Frequently Asked Questions

How can I identify plant gender before the plant actually starts flowering? (Besides using feminized seeds)

There are a few ways to identify plant gender before the plant actually starts flowering, and each is helpful in different situations.

  1. Start with a clone – A clone is an exact copy of another plant. If the “mother” of the clone is a female plant, it means the clone is also female
  2. Look at preflowers (identify plants when they’re 3-6 weeks from seed) – If you know where to look, cannabis plants will actually reveal their gender in the vegetative stage when they’re just 3-6 weeks from seeds. Male plants usually show their gender by 3-4 weeks and female plants usually show their gender around week 4-6 from seed. Learn how to determine the gender in the veg stage by looking at preflowers.
  3. Test the leaves of your seedling – It’s possible to send in a leaf from a young cannabis plant to a specialized testing company, and they will be able to determine the gender as soon as 3 weeks from seed! Although I haven’t used any of these companies and can’t recommend any in particular, here’s a link to one example just so you can see what I’m talking about. From talking to other growers who use this method, it appears to be very accurate.
  4. Take a clone and force it to start flowering – if you take a clone from a vegetative plant, you can force that clone to start flowering and reveal its gender. You’ll know the gender of the “parent” plant by the gender expressed by the clone. In my opinion it’s better just to look at the pre-flowers since they’ll usually tell you sooner than if you use this method (in this case you have to wait for the seedling to get old enough to clone, then wait for the clone to make roots, then wait for the clone to start flowering – which usually takes weeks longer than the much easier pre-flower method).
  5. Look at the seed itself – Some growers swear by this method (if someone knows the author of this popular but anonymous picture that has been circulated on the internet since at least 2008, please let us know!). The idea is to look at the seed’s characteristics because to some extent, some seeds look “more female” than others. According to people who use this method, it’s better than random guessing but unfortunately in the best-case scenario, even the growers I’ve talked to who have experience using this method say it only has up to 70% accuracy. That means about 1/3 of “female” seeds end up being male. It also creates false negatives, which means that about 1/3 of the “male” seeds you’re throwing away are actually female. It’s better than 50/50 but when using this method; it’s not a way to ensure that all plants are going to be female. Personally, I do not recommend using this method as a way to identify gender. I believe all the other methods are much more accurate and depend less on needing experience!

Can I Make a Breeding Program Using Just Female Plants and Feminized Seeds?

Yes, it’s possible to use just female plants and feminized seeds for further breeding, with one major caveat.

Without careful and thorough testing, it may be possible to accidentally select for cannabis plants that tend to herm (make male flowers or pollen) and cause seedy buds when you don’t want them to.

For each possible “mother,” clones should be grown in several different environments and tested thoroughly to make sure that the mother plant does not have any tendency to make pollen naturally in normal or stressful conditions. It’s okay if plants grow pollen sacs if induced chemically since that is very unlikely to happen in someone’s garden on accident, but you don’t want plants that will start growing male parts on their own without chemical induction. Thorough testing of plant hardiness is always important when breeding, but it may be especially important when breeding feminized seeds together.

Are there other reasons I should avoid breeding seeds without males?

The most common reason growers say you shouldn’t do this is because it’s “unnatural” or doesn’t “seem right.” Some growers say you need male plants for genetic diversity. I’ve also heard growers say that the resulting plants will be weaker, sterile, less potent and once someone even told me that resulting plants “will be worse in every way.”

As of yet I haven’t seen any of these claims backed by actual personal experience, or any real-life examples showing why using feminized seeds is not a viable way to breed new strains.

To those who say this type of reproduction just doesn’t seem right, the evolutionary strategy of plants using only female and hermaphrodite plants to breed is actually pretty common and is known as gynodioecy. One example of a plant that only reproduces this way is a flower found in Canada and the US called Lobelia siphilitica, also known as the Great Lobelia. Obviously this reproduction method isn’t exactly the same as artificial feminization since the pollen production is caused naturally instead of induced chemically, but examples of gynodioecy show that a female flower-based breeding population can exist in the wild even when no plants are purely male.

The Great Lobelia naturally reproduces using only female and hermaphrodite plants. This is similar to the cannabis feminization process because it results in a population of plants that all primarily grow female flowers, with no pure male plants

When it comes to genetic diversity, the ability to cross out to thousands of different cannabis strains allows you to dramatically increase the gene pool without using male plants.

So those are my answers to the common objections of a feminized seed-based breeding program, however I am just a theory-crafter when it comes to this topic.

It certainly seems possible that a feminized-only breeding program could run into unforeseen problems down the road, but as far as I know there isn’t any evidence of that so far.

Although I have a few anecdotes from growers who have used only feminized seeds for a few generations, it would be much better to share information from someone who has conducted plenty of testing over several generations. We’d love to hear from you if you have bred more than a few generations using only feminized seeds and want to share your experience!

What are positive aspects of breeding two feminized seeds together?

Besides not having to worry about male plants in the next generation, the main advantage of doing this is you have a much better idea what you’re working with when it comes to producing the type of buds you’re looking for. When you’re growing a male plant, it has several genes it will pass to its offspring that has to do with how buds develop, but since it’s a male plant those genes aren’t expressed and it’s hard to figure out what they are.

Historically, the way to learn more about the “hidden genes” contained in a male plant is to breed it to several well-known female plants, and see how the offspring compare to each other. The genes that don’t come from the known mother plant are assumed to come from the male. Another way of going about this is to take several clones of the same well-known female plant, and breed them with many different male plants to see which ones produce the best offspring.

After testing with several pairings, you start to get an idea of the hidden genes a male plant has to offer to its female offspring. This time-consuming process of documenting and identifying good male plants is why proven stud male plants are one of the most valuable and closely guarded types of clones available today.

But the process of finding the right “father” is a little different when you start with two female plants. In this case you already know quite a bit about the genes of both parents because you can just look at and test the buds of both plants directly. This allows you to pinpoint desirable genes with less guessing and much less time spent growing out and cataloging plants!

Why even have male plants then?

In nature, male plants are very effective at increasing genetic diversity by ensuring cross pollination. With only purely male and purely female plants, every resulting seed will have two different parents.

Another big advantage in the wild of having separate female and male plants is sexual specialization. In other words, plants are able to evolve male and female traits separately, so each type of flower can become more specialized at its unique “job.”

However, this isn’t the only successful breeding strategy for plants. In fact, only 6-7% of plants have completely separate male and female plants like cannabis plants do (known as dioecious plants). Most plants grow some mix of male and female flowers on each plant, with different combinations offering different evolutionary benefits.

You might enjoy this scientific article if you want to learn more about the evolution of sex determination in plants and animals: Sex Determination: Why So Many Ways of Doing It?

And although most cannabis strains (at least the good ones) display either purely male or purely female flowers, there are some wild populations (and some strains of hemp) that regularly produce plants with male and female parts on the same plant.

When it comes to artificial selection for breeding new strains, the grower is in charge of cross pollination, so there’s no need for the plant to specialize in male parts. Pretty much the only thing most growers care about is how female flowers develop. So (unlike in nature) growers have the freedom to choose plants that improve female buds without even having to consider how it might affect male plants.

Can feminizing seeds result in hermaphrodite plants?

The answer is yes. If you do it the wrong way then feminization can lead to plants with an increased chance of herming. However, with a well-tested and well-bred feminization program, one of the main goals is to breed out any plants with hermaphroditic tendencies that show up under normal conditions. When you buy feminized seeds from trustworthy breeders, you can count on the fact that every plant will end up growing only female flowers and that’s it.

This is a relatively big topic with a lot of controversy so I wrote a whole article about it if you want to check it out!

Can I pollinate the same plant I collected the pollen from?

Yes, it’s possible. However, it’s not really recommended because for one, the timing doesn’t match up. By the time your pollen is ready to use, your original plant will already be several weeks past the optimum pollination point. It’s best to pollinate a female plant that has only been flowering about 2-3 weeks. It’s also possible to run into unwanted side effects from self-pollination/inbreeding.

One thing to keep in mind is even if you pollinate a plant to itself, the resulting seeds are likely not going to be exact copies of the original (unless the original plant is extremely inbred). The resulting seeds will be a mix of both the mother’s expressed genes and her hidden ones.