S1 Cannabis Seeds

High Times recently sat down with Compound Genetics in Portland, Oregon to discuss seeds, genetics, breeding methods and more. It is not rare to see novice growers wondering what IBL, BX or S1 mean. While they may seem useless, these acronyms give plenty of information when we E T H O S Even for the most experienced growers, the wide variety of acronyms, abbreviations, and nomenclature within the cannabis genetics industry can be confusing because it lack specificity.

The High Times Interview: Compound Genetics

Want to know some specifics about breeding cannabis? Know the difference between regular and feminized seeds? Ever heard of an S1, F1 or F2? Do you have any idea what any of it means? I got the chance to link up with Compound Genetics in Portland, Oregon a few month back, and I was lucky enough to sit down with them and talk a little bit about different breeding methods and some terms that are commonly used.

High Times: Can you please explain what an F1 and F2 are when it comes to breeding cannabis?

Compound Genetics: F1 is the first generation [of plants] from unrelated parents. You take a male and a female, you cross them and you create an F1. The F2 is when you work that first generation into the second generation. For example, you could take a Legend Orange Apricot F1, which would be an Orange Apricot male to a Legend OG female, which are completely unrelated parents. When you cross them, the seeds that come from that will be the Legend Orange Apricot F1 generation.

To create the F2, you would take a male from that first generation that you selected from seed and a female from that first generation that you want to breed into the next generation. You would pollinate the F1 female with the F1 male pollen, and the seeds that will be produced will be the Legend Orange Apricot F2.

If you work that into an F3 and F4, once you get past F4, you are in IBL. To do that successfully, you really need to make sure you don’t lock down too many of the same traits, and you’re not bottlenecking because you can create a big mess if you lock down too many of the same traits. You want to keep the gene pool open.

Once you get past F1, it becomes really advanced breeding. F2’s can be a big mess if they aren’t done right. You can send it in the wrong direction by selecting bad parents. F2’s should be left to people who know what they are doing. Very few people work into the F2 and beyond anymore. More people are playing in the F1 generations.

HT: What can you tell us about S1’s and feminized seeds?

CG: It’s also called “selfing.” It’s a part of making feminized seeds in a sense. I think people confuse it with bag seeds sometimes. Bag seeds aren’t always S1’s. Bag seed can be an S1, or it can be from pollen on you floating around and you brush up against a plant. If it’s on you and you brush up against a plant, you just pollinated a plant. S1’s could be made other ways too. It can be caused naturally, like stressing the plant so it forces itself to make S1’s—whether it’s light leaks, feeding or mistreating. S1’s could be created by a breeder, by part of a reversal where they actually spray a mixture of chemicals onto a plant, and it will turn a female plant into a male plant over time.

For example, if I took a Jet Fuel Gelato female and reverse it to force it to turn into a male, I collect the pollen from that reversal,and hit it onto a Jet Fuel Gelato female, the seeds from that cross would be the Jet Fuel Gelato S1’s, which would be the feminized version of Jet Fuel Gelato

S1’s are feminized; 99 percent of feminized seeds will be female. S1 and R1 are considered different. R1 is the equivalent of a feminized F1. F1 is the regular version. Regular is the industry term for a male seed. Feminized is the industry term for a reversed seed or feminized seed. You get feminized seeds from reversing, and you get regular seeds from using a male. The method you would do for S1’s would be the same thing you do to make feminized seeds. You spray it on the plant in certain periods of the early flower cycle, and it makes the plant switch sexes. You can take any female plant and spray over a two to three week period. It won’t grow any female flowers at all. It will actually start to grow male flowers. The whole plant will turn into a complete male. It will release pollen, but reversed plants never release the same amount of pollen as a male plant. Male pollinations will almost always have more seeds. That’s why many breeders prefer males because you can get so many more seeds, and you can do a lot more with males.

With reversals, it’s kinda hit or miss. You can get a small amount of pollen, or sometimes you can get almost no pollen. Some plants don’t want to spit pollen when you reverse them. If you are reversing a plant and you want to create a bunch of seeds, you going to need to reverse a lot more plants to collect enough pollen versus having a male around which dumps pollen. I would need two males to pollenate a grow room the size of this hotel room. It would take 20 reversed plants to do the work two males can do, and you would have to apply the pollen with direct contact, like brushing the pollen on the plants or hitting the females with a male branch. You have to actually work the plant to spread the pollen, because it’s not dumping pollen like the males plants would. There are a lot of different methods you can use to apply reversed pollen onto other plants.

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Jet Fuel Gelato (Photo Courtesy of Compound Genetics)

Feminized seeds kinda have a stigma in the industry. People frown a little bit upon them as if they are made from Monsanto. Genetically modified, not natural, they really have their purpose. The fact that you can run a whole garden of feminized seeds, and you don’t have to worry about weeding out or selecting males. For a beginner grower, it’s perfect. For someone who doesn’t know how to select males, they can just take feminized seeds, run them, and know they do not have to worry about finding any males pollenating their crop and losing their crop because a male slipped through the cracks.

HT: Can you tell me more about hermaphrodite plants?

CG: It definitely is an unstable trait, and it’s definitely more prevalent in untested and unworked gear that is bred from unstable plants. If you are going to create a feminized seed, one of the most important things about fems is that you should never reverse a plant that is unstable. If you reverse a plant that has unstable traits, it’s going to continue those traits onto the next generation.

HT: Can regular plants still throw out herms?

CG: Oh, yeah. Definitely. It can be from that same factor from breeding unstable traits to begin with or environmental issues. In general, it’s usually a genetic trait. Strong genetics that are worked well won’t hermaphrodite under any circumstances. Sometimes when you run seeds from the first generation, some will hermaphrodite, but if you clone them and run them again, that trait won’t come out once you don’t run them from seed. I don’t know exactly why that is true, but it definitely happens. I advise anybody running from seed that experiences hermaphrodites, if it’s a plant that looks real good late in flower, run it again from clone and see what happens. Sometimes, those traits don’t come out in clone. You really can’t do anything to stop them.

I don’t recommend people spraying “Switch” or anything like that. Same goes for any chemical product that’s going to revert your plant back. If your plant is showing that trait, you should either be prepared to live with that trait, eliminate that plant, try to breed it out by outcrossing or crossing it over a few generations, or reverse something onto it that’s going to help eliminate that trait.

HT: What would be your preferred method for collecting pollen, and around what time is best to harvest pollen from the males? Do different males throw out pollen at different times?

CG: Males throw out pollen usually between week 3.5 – 5. That’s usually when they are known to drop pollen. After week 6 or 7, they kind of get spent. If I was going to collect pollen, I would try to collect it around week 4.

There are various ways you can collect it. You can just go up to the male and get a bag, box or something like that and collect it over time by leaving the bag or box open under the plant, or you can take a whole branch of the plant and just literally put it in a bag, just shake it, and all the pollen will come off. Then, you will be left with the male parts of the plant. What you can do with that is take the male pollen sacs, sift or filter it out, then you are left with this fine powder. Ultimately, you just want to have just powder, and storing it clean and dry. The key to saving pollen long periods of time is having it dry. Moisture is the killer for pollen. Light as well. Anything that is bad for dried cannabis will be bad for pollen.

Sour Gelato (Photo Courtesy of Compound Genetics)

HT: What’s the longest you can keep properly stored pollen viable before having to go through another round to collect pollen?

CG: If it’s stored properly, you can keep it for a long time, but generally pollen tends to fade after a year or two. It’s not something that should be your long-term [plan] for saving genetics. To save them long-term, you have to save them in seed form. The best method is using a male of course, but to get the true genetics into seed form, if you can self it, that’s how you can really save anything. If you want to save all your cultivars, S1 everything. You will have pure versions of those clones only in feminized seed form. When you hunt those seeds, you can find the same traits and exact same examples of the mother plants you’re reversing, plus you might find versions that are even better.

S1’s will have the same exact phenotypes that you reverse, plus it will have other unique versions. You can find some better versions of the clone-only mom in the S1’s. If you are trying to save your genetics for a long [time], S1′ s might be the way to go.

Basic nomenclature of cannabis genetics

Often, when it’s time to buy cannabis seeds, the beginner grower can quickly become confused by some of the acronyms that are written next to the name of the variety. Simply by learning some basic concepts you’ll be able to make the correct choice between seeds with the same name, but different acronym.

There is a big difference between acquiring a second filial generation (F2) or an IBL, even if we talk about seeds of the same variety. These differences will condition the growth pattern of the plants, and also the final product, so that it is almost essential to learn exactly what is the meaning of these acronyms to be more accurate in choosing which seeds to buy, saving ourselves deceptions and getting closer to our preferences.

Pure varieties

Also known as landraces or purebreds, pure cannabis varieties have been the basis of cannabis breeding over the past decades. These species are endemic to a geographical area, where they have developed without having been crossed (hybridised) with other varieties. There are a large number of landraces from all around the planet, belonging to any of the three families of cannabis, C. sativa, C. indica and C. afghanica. Nepal is a good example; in this country different pure cannabis varieties (mostly narrow-leaved mixed use varieties) are grown and you can easily see the differences between genotypes based on the height above sea level at which they are cultivated.

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Each variety expresses its genetic code (genotype) with a certain growth and flowering pattern (phenotype), so that pure varieties – with a purest genotype – show great uniformity, with just a few slight differences between phenotypes. We can expect very little variation between landrace specimens of the same variety, giving plants with very similar growth, organoleptic and psychoactive traits. Good examples of these varieties can be Hindu Kush (Sensi Seeds), Colombia Punto Rojo (Cannabiogen) or China Yunnan (Ace Seeds).

IBL or stabilized cannabis hybrids

The IBL acronym (in-bred line), means that the cross was made using plants with almost identical genotype (inbreeding). On the contray, outbreeding is employed to introduce new genes into the variety. Although it happens naturally, self-pollination is a common technique used by breeders to fix desirable traits and thus stabilise the genetic line, either with landraces or hybrids. In cannabis genetics IBL seeds should present a highly uniform growth. Classic IBL examples are Skunk and Northern Lights (Sensi Seeds) or White Widow (Greenhouse). There is a lot of work behind IBL’s like these, as a large population of pure specimens had to be used to select the correct parents. In addition, the breeder must fight against inbreeding depression, the result of crossing parents with very similar genetic information. The reward for this job made properly is a highly stable seed variety.

If we make a cross between two different landrace or IBL lines (parental A and B) with different genotypes, the resulting offspring will be the F1 hybrid, the first filial generation from the cross of the phenotype #1 (Parent A) with the phenotype #2 (Parent B). Commonly in this kind of crosses we will observe a very uniform offspring, depending on how stable the parents are, of course. The F1 hybrid between two pure varieties or IBL’s will show the so-called hybrid vigour – also known as heterosis or outbreeding enhancement – introducing new genes that will produce “better” specimens.

Varieties like Orient Express (Ace Seeds), Red Afro (Tropical Seeds) or Eddy from Original Delicatessen would be good examples of true F1 hybrid. Thus, we refer to the first filial generation of any cross as an F1, while the term “F1 hybrid” is used when the parents are different landrace or IBLs.

How to create a polyhybrid

When we cross two F1 individuals (whether landraces, hybrid or polyhybrid varieties), we obtain the second filial generation or F2, and so on with next generations, F3, F4, etc. The second filial generation often gives a more heterogeneous offspring than the F1; we can expect 25% to resemble parent A, 25% to resemble parent B and 50% will be a mixed expression of traits from both parents. As a consequence the stabilisation work must continue generation after generation ( F3, F4, F5…) until we find the generation that gives a uniform offspring with the traits that we are seeking.

Many of the seeds that we can find in shops are polyhybrids, crosses between different hybrids. The offspring of such crosses are in many cases quite unstable, producing plants with very different traits. Keep in mind that in these cases, the genetic mix is very varied, so we can not expect polyhybrid offspring to be as homogenous as an F1 hybrid. It’s easy to imagine how complex it can be to stabilise a cross, since we are mixing different genes from different varieties, which makes the selection and stabilisation process of the different traits a very hard work. The vast majority of hybrids on the market are in fact polyhybrids, like the White Russian (Serious Seeds) or Fruity Jack / Jack el Frutero (Philosopher Seeds).

BX or Backcross

Backcrossing is a common technique used by breeders to fix certain traits. This is done by crossing one of the progeny (F1, F2…) with one of the original parents (recurrent parent) which has the desired trait. To have an even more stable expression of the desirable trait, you can cross the BX1 again with the recurrent parent to have a BX2 (squaring) and so on with BX3 (cubing), BX4, BX5.

This technique is also used to replicate clones in seed form. It is done by choosing a male parent to cross with the clone only, backcrossing it as many times as needed to get an offspring as similar as possible to the original clone. The Apollo 13Bx (TGA Subcool) is an excellent example of this technique.

Tropimango by Philosopher Seeds

S1, feminised cannabis seeds

The acronym S1 refers to the first filial generation produced as a result of crossing the plant with itself. This is achieved by a range of techniques aimed at reversing the sex of the selected female plant, getting it to produce male pollen and using it to pollinate itself. If it’s done properly, we get feminised offspring with the same genotype of the parent used.

As always in genetics, the more stable the parent is, the more stable the offspring will be. This technique can also be used as a regular backcross, selecting and fixing traits but starting with just one parent. Thus, we can find S2 or S3 seeds, which have been backcrossed again with the original parent. Examples of S1 are Tropimango (Philosopher Seeds), S.A.D. (Sweet Seeds) or Trainweck (Greenhouse).

The articles published by Alchimiaweb, S.L. are reserved for adult clients only. We would like to remind our customers that cannabis seeds are not listed in the European Community catalogue. They are products intended for genetic conservation and collecting, in no case for cultivation. In some countries it is strictly forbidden to germinate cannabis seeds, other than those authorised by the European Union. We recommend our customers not to infringe the law in any way, we are not responsible for their use.

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E T H O S

Even for the most experienced growers, the wide variety of acronyms, abbreviations, and nomenclature within the cannabis genetics industry can be confusing because it lack specificity. The large spectrum of terms can be hard to parse and hard to keep up with, especially if you’re new to growing or getting back into it after an extended hiatus. Creating a consistent language is imperative for progress in any advancing field, especially genetics. ETHOS uses a specific nomenclature to reference all of our cultivars. For that reason, we’ve decided to clarify our terminology and nomenclature.

ETHOS Nomenclature
ETHOS was founded on the principle that the current landscape of genetics could be improved through standardization. For that reason, we have stuck to a very specific, consistent methodology for naming our genetics. Generally speaking, letters indicate the process by which the genetics were produced and the number indicates the generation and/or variance expressed by those genetics.

Here’s how ETHOS refers to its various offerings:

S1 – “Selfed” First Generation
An S1 is the result of a plant being crossed with itself, without any other plant being involved in the procreation. There are a variety of ways to induce this effect in a plant, but the general understanding is that any plant with an S1 label has only one female parent’s set of genes. The female parent pollinates herself or a clone of herself. This term is only used when a plant is crossed into herself. Any back cross or hybrid will have a different term. Often, the term “S1″ is misused in a broad stroke manner to describe any female seed which is incorrect. S1’s can only be those female seeds produced by a single parent.

F1 – Filial (Offspring) First Generation
By definition, an F1 is the result of the initial cross between two unrelated and stable cultivars. For example, Parent One (P1) and Parent Two (P2) could be crossed to result in Plant A, an F1 offspring. This is the first generation resulting from the cross of these cultivars.

BX1 – Back Cross First Generation
A back-crossed offering involves taking a filial and crossing it back into one of its original parents. Using our example from before, P1 crossed with P2 yields A, our F1. By crossing A with either P1 or P2, you produce a back-cross (P1A or P1B), either cross resulting in a first generation back-cross (BX1).

RBX (Reverse Back-cross)
A reverse back-cross is a back-cross that involves a female pollen donor.

F2, F3, F4, F5 and Successive Filial Generations
What’s the difference between an F2 and an F5? F2 is when two filial from an F1 are crossed with one another. The goal of this continued breeding within cultivars is to stabilize the expressions of the plants, narrowing the variances to a handful instead of hundreds. If you continue this process, the next round is F3 and so on. (two filial from an F2 are crossed, resulting in an F3). In modern cannabis, variety homogenization starts to set in by the F3 stage. F4, F5 and beyond will likely be the most stable expressions of that particular variance.

V1, V2, & V3 – Versions
A “V” indicates a slightly different version of an existing cultivar. As expressions stabilize and versions homogenize, different versions are identified by a V and their respective numeral. A plant with two distinctive versions would be labeled as a V1 or a V2. You typically won’t see a V1 as the first version of the cultivar is its first version, regardless of whether it is an R1 or F1. A V may be used to identify cultivars who have been bred with the goal of an existing cross but using different parents than the original version.

For example:
Mandarin Cookies R1 (V1) = Forum Cut Cookies x Mandarin Sunset
Mandarin Cookies V2 = ETHOS Cookies x Mandarin Sunset (Second Version of Mandarin Cookies)

>> Leaves a void with only the F1 system. And very rare to properly use the term F1 in modern cannabis

Difference of Opinion
Technically, an F1 is a cross of two unrelated parent cultivars. So, in theory, that would mean that each parent would have to be distinctly unrelated to one another, even in its traceable lineage. In classic genetic models, this would look something like Purple Basil x Green Basil. But, given the hybridization of the genetics industry, are there any true F1’s left in cannabis?

Genetic models for classification that exist in current academia are based on 2 qualifications:
• That the parents are unrelated
• That the parents are already stabilized.

This leaves a massive void of accuracy within the F1 system. Very rarely will you see brands and shops properly use the F1 term in modern cannabis.

Less than 5% of the parents used in seed-making are genetically stable, and more than 80% of dispensary cannabis has one parent with some genetic relation to the other, and in more than half of the cases, the parents share significant amounts of genetic relation. So, while we refer to crosses from two unique parents as an F1, can we even predicate our terms and nomenclature on a preexisting construct that fundamentally doesn’t apply to this specific space of cannabis breeding?

ETHOS will always be transparent with its labeling and lineage of its genetics. This is how we feel genetics should be labeled. Everyone in this industry has a different approach, and this is ours. If you agree and enjoy the consistency and transparency of our product offerings, we invite you to subscribe to our content and sign up for the only genetics membership you’ll ever need.