Best Temp And Humidity For Germinating Weed Seeds

ILGM

Buy Cannabis Seeds Online

The temperature for germinating cannabis seeds is best at 78° F (25° C) because both low and high temperature impairs germination and growth. The best Climate is key to cannabis growing. In this post we analyse the importance of relative air humidity at every growing stage. We’ll define the ideal hygrometric level … So what is the best temperature for growing weed and what about the humidity in your grow room? Check it out!

Grow Smarter & Profitably By Cultivating Your Smarts

Implementing Standardized Cultivation Environments Are Especially Important Since All Problems Impacts Revenue & There’s Little Margin For Error At Scale.

Here’s The “Faces” Of The Cannabis Industry (Retail Dispensary Agents)

Let’s Train Skilled & Talented Dispensary Technicians That Drive a Higher-Quality Retail Experience That Delivers Positive Outcomes With Everyone, Every Time.

” * ” indicates required fields

METRC Tracking System Training

Learn How One Tool Can Manage Your Retails Dispensary Operations, Track Cannabis Taxes & Stay Compliant.

Edibles Are A HOT Topic & You Never Want To Making People Sick!

Our Cannabis Product Manufacturing & Recognized Food Safety Training Covers Everything From Topicals, Edibles to Concentrates & Formulated Products.

” * ” indicates required fields

Calendar & Checklist Training

Replacement Free Trial Coming Soon! It’s Called “Cannabis Infused-Edible Products” (In The Meantime TRY This).

Our Biz Is Actually “Compliance” (We’re Just Lucky To Sell Cannabis)

There’s Always That “Un-Fun Thing” With Any Job & Our Compliance Training Provides What’s REQUIRED to Be Compliant & Conduct Commercial Activities.

” * ” indicates required fields

COVID Cannabis Industry Safety

During COVID-19 Pandemic a 9-Letter Word Was a “Game-Changer” for Our Legal Cannabis Industry: “Essential.”

Cannabis Topics, What’s New

Cannabis Air & Temperature for Germination

The temperature for germinating cannabis seeds is best at 78° F (25° C) because both low and high temperature impairs germination and growth. The best conditions are native conditions so if you know what type of cannabis that you are growing, you will be able to better match the optimal growing conditions for that variety.

When your seed has sprouted and is growing then your plant is ready for their vegetative growing environment. They will be better able to handle cooler temperature, more intense light, and lower humidity levels.

Be sure to avoid high temperatures and lower intensity of light levels since this will stunt growth and cause very ‘lanky’ formation of the plant.

Necessary Air (Oxygen) for Germination

The last basic necessity for seed germination is air so if a seed is allowed to be in a very moist, soggy growing medium, it will cut off all oxygen supply to the seed.

Another common way seeds get deprived of oxygen is planting them too deep in the medium, this is because the moisture and depth of the seed will cause a lack of oxygen and your seed will not thrive.

Cannabis seeds come provided with enough food within their shell for them to be able to germinate and break through the soil. But, if seeds are planted too deep in the ground, they will not have enough energy for them to be able to break through soil that is too deep.

A good rule of thumb for planting cannabis seeds is to plant them about a quarter of an inch (0.25 inches or 6 mm) deep.

Let us know what you think.

(NOTE: Before you can optimize training, you must do is get a clear picture on WHO is learning, HOW do they make an impact, and WHAT their requirements are. Download our proven “Cannabis Training Optimization Strategy” now and get clear on what’s needed to learn.)

What is the optimum humidity level for each stage of cannabis growing?

In order to start growing in the best possible conditions, it is adamant to understand the meaning of this technical term. Relative air humidity levels give us information on the concentration of water vapour in the air.

It is important to realise that air humidity is closely connected to air temperature, as hot air is more humid than cold air.

That’s why an air conditioning unit dehumidifies and cools the air at the same time.

When air humidity levels come close to 100%, the air is not capable of retaining the excess moisture, which leads to condensation in the shape of small droplets of fog, morning dew, or rain.

See also  Germinating Cannabis Seeds In Rockwool

For instance, if the temperature of your grow space is 30ºC, with a relative humidity of around 33-35%, and the temperature suddenly plummets to 10-12ºC, the humidity level can quickly reach 100%.

This can become a critical situation at the end of the flowering period if the ‘dew point‘ is reached. This is a parameter that reflects the cannabis flowers’ humidity level. Bad management of the relative humidity levels of your grow space, caused by abrupt temperature variations, could lead to the appearance of mould in your buds.

Related post

Air circulation for cannabis growing

So what is the most favourable humidity level for each growing stage?

Here we show you the ideal humidity levels for every growing phase of your cannabis grow.

Germination / beginning of the cuttings’ rooting period

It is really important to maintain a relative humidity of 80-90% in your mini greenhouse during this phase. This applies to seeds that have just sprouted and also to young seedlings (0-10 days old). These still don’t have a strong radicular system and are therefore pretty fragile.

They require high moisture levels so they can concentrate all their resources on the development of a strong and vigorous root mass. The correct day temperature should be 25-26ºC, and 21-22ºC at night.

Young seedlings and 10-day-old clones

At this point, the required hygrometric conditions should range between 70 and 80%, with similar temperatures to those in the initial stage.

The moisture level for this phase needs to be quite high as the root mass is not very vigorous and actually non-existant in the case of the young seedlings. That’s why it’s necessary to point all technical parameters towards this objective.

It is essential to maintain the correct relative humidity as cuttings will start to develop their first roots between 12 and 20 days after having been planted in the growing medium. This is a crucial point for the appropriate evolution of these young plants.

Growing phase

At this stage the young seedlings, derived from seeds or cuttings, will have developed a radicular mass that is significant enough for them to feed through and therefore reach their maximum potential before being transplanted to a new pot for further development.

Establishing new climate conditions at this stage is vital as the aim is to achieve a reasonably high humidity level, but slightly lower than at the beginning. A good balance should range between 60 and 70%.

Temperatures must be kept between 22-28ºC during the day and 18-22ºC at night. These conditions guarantee the plants’ well-being and facilitate good metabolic function, as well as overall optimum development.

At this point, the radicular system is strong enough for the plant to absorb a higher amount of nutrients and develop a much more resistant immune system.

Early flowering

At the start of the flowering period, when the ‘stretching’ or the final growth boost occurs, plants need specific climate conditions for this transitional phase.

As this is still a transition period in which plants progressively end the veg phase, the humidity level needs to be set at 50-60%. It is also essential that the temperature remains between 20-26ºC both day and night.

This prevents thermal shock and guarantees that plants will be ready to produce those delicious flowers. It is vital that their well-being is taken care of so they can concentrate all their resources on their final objective: quality and quantity. These measures are valid for the first 3 to 4 weeks of flowering, depending on the strain.

Late flowering

In the second part of the flowering phase the humidity level must be reduced to 40-50%. In the two to three final weeks it’s preferable for this figure to be closer to 40%.

This is absolutely essential, particularly if you’re growing strains that are sensitive to mould or that produce dense flowers.

If you follow our guidelines, chances of botrytis hitting your flowers will be slim. As far as temperature goes, we advise you to stick to 18-24ºC during the day and 17-20ºC at night.

This way you’ll be able to control your flowers’ dew point, which is crucial in order to prevent fungi and avoid ruining all your hard work.

Author

Brian Worms After completing my studies in International Trade and Marketing in France, I’m more interested in the world of communication today. Blogger, grower and real cannabis toker for more than 20 years, always looking into the rarest and finest cannabis genetics. My passion for cannabis is so deep that it’s become something of a lifestyle now… My work is like a dream come true.

See also  Single Cannabis Seeds

Categories

  • Cannabis activism
  • Hot news
  • Cannabis Genetics
  • Cannabis Growing
  • Growing techniques
  • Trimming techniques
  • Biological prevention
  • Organic Growing
  • Fungi
  • Indoor Growing
  • Outdoor Growing
  • Harvest
  • Grow Reports
  • Nutrients and fertilizers
  • Plagues
  • Medical Cannabis
  • Weed Recipes
  • CBD
  • Risk reduction

Most popular posts

Can marijuana lead to addiction?

Differences between cannabis and hemp

Cannabis types and varieties

Don’t miss any posts!

Subscribe to our newsletter and stay up-to-date with the latests cannabis news.

Best Temperature and Humidity for Growing Weed

Getting the temperature right for your cannabis plants is an essential part of each stage of the growing process. If the temperature in your grow room or outdoors is too hot or too cold, your young weed plants will not be able to photosynthesise properly, and this will inevitably affect their growth and development. However, it is not as simple as saying ‘this is the correct temperature; the temperature needs of the plants vary according to their stage of development, so you must have some knowledge of their requirements. To help you, we have written this guide which will explain the best temperature and humidity for growing weed for each phase of your young weed plants.

Now, we understand that establishing the ideal temperature for weed plants can be tricky – some say that it is as much instinct as it is science. However, it is certainly possible to work things out for the growing conditions of your plants, and this article will tell you everything you need to know.

What you need to know about temperature and humidity

The first thing you need to understand is the close relationship between temperature and humidity levels. Let’s look at science. Humidity refers to the amount of water vapour present in the air. At higher temperatures, molecules move at top speeds; thus the probability of condensation of water vapour due to the collision of molecules is less. This makes the air hold more water vapour at high temperatures. In other words, as the temperature increases, the humidity of air also increases.

Most plants including cannabis plants, need humid air to thrive. This is because the pores through which they breathe lose most of their moisture when the surrounding air is dry, a loss that the plant can’t always replace through the water absorbed by its roots. The thinner the leaf – and cannabis plants have quite small, narrow leaves, the higher its need for humidity.

When deciding the correct temperature for your plants, therefore, it is also sensible to assess the humidity levels as the two go hand-in-hand. To do this, you should invest in a good-quality thermometer and a hygrometer, ideally digital models with the ability to store historical maximum and minimum levels.

When the temperature is 68°F (20°C), air can absorb 7.2 ml of water maximum. When this occurs, the air has a relative humidity of 100 percent. There will be so much water vapour that the air will be as dense as a cloud and will affect your ability to see anything. Air with a temperature of 32°F (0°C) is only able to absorb about 5 ml of water. This is the reason why the air is a lot drier in the winter than in the summer.

Temperature and humidity for the germination phase

The first moments of your cannabis plant’s life are crucial. Germinating seeds indoors will allow you to have more control over the temperature, but it is also possible to do so outdoors if the climate conditions allow. Having a high temperature (from 22 to 26°C) is an important factor for your seeds to decide to emerge into the world.

However, the temperature must not fall to less than 20 degrees Celsius nor rise to more than 30. If you are using a greenhouse for the germination phase, be warned that it can get sweltering so you must regularly monitor the temperature. Humidity must also be continuously monitored. If the seed trays dry up, germination will not take place or recently sprouted shoots will wither and die. You must not forget to add water when necessary – a spray dispenser is gentle for this, but you should not give them too much water. The seeds should only be soaking wet during the first two days.

See also  Marijuana Seeds For Sale New Hampshire

Once the first seedlings emerge with two cotyledons (the first two round leaves that develop), they should be carefully transplanted. If the seeds are autoflowering, you should transplant them to a large pot. If they are feminised seeds, however, you can transplant them to a smaller container and move them to the large bowl when they are a bit more established.

Best temperatures and humidity for the seedling phase

The optimal conditions for cannabis seedlings are a sunny, warm (20-25ºC) and humid environment with well-circulated air. Their underdeveloped root systems mean that seedlings need to be exposed to lots of light and heat. Problems arise as their immaturity means that they cannot withstand high temperatures. Therefore, we recommend that growers maintain 20ºC to 25ºC indoor environments when the lights are on.

Humidity levels also need to be high. Levels between 65 percent and 70 percent are sufficient for seedlings to absorb enough water through their leaves.

Optimal temperatures for the vegetative phase

You can start to relax a bit during the vegetative phase. As cannabis plants mature, they grow stronger and better able to cope with extremes of heat. They start to be more resistant to heat and cold. You can raise the temperature to as much as 30ºC.

As the roots have sufficiently developed to absorb plenty of water, you may wish to reduce humidity levels by 5 percent each week. The relative humidity should ideally fall between 40 percent and 70 percent.

The best humidity and temperatures for the flowering phase

The last phase of the cannabis growth cycle is the flowering phase. Growers should aim to maintain warm temperatures that are pretty much the same as when the plants were at the seedling stage. Ensure that the temperature stays at a nice warm 20ºC to 25C to prevent buds from burning their terpenes. This will allow your plants to produce deliciously potent flowers.

It is also a good idea to lower humidity levels to about 40 percent to 50 percent, especially during the late flowering phase. This encourages the production of highly-prized resin and a higher terpene content leading to a more aromatic and flavourful crop.

Cultivators should be advised that typical temperature variance when the lights are switched off is 5ºC, and this applies to all the phases of development.

Temperatures that are too cold

Temperatures that are too cold will slow down a cannabis plant’s metabolism and its roots system will become increasingly ineffective. If temperatures drop below 12 degrees, the plant is even at risk of death.

The obvious solution to boosting the temperature of the grow room is to get an electric heater and plug it in. This has several disadvantages, however, mainly due to its high consumption of electricity but also because of its drying nature which can affect levels of humidity, and the direct distribution of the heat which makes it hard for all the plants to enjoy the uneven heat. An oil-filled portable radiator is another option if you can get one which isn’t too large to fit into the grow space. We recommend small tubular electric heaters which can be placed conveniently on the floor and only use a few watts of electricity. Radiating cables for indoor use are another excellent alternative, especially if you need to heat trays of seedlings.

Temperatures that are too hot

Reducing heat levels in a grow tent can be much harder to control than the reverse. We recommend using electric fans to circulate the air as much as possible to disperse the heat and thus cool the young cannabis plants.

Placing an exhaust fan in the ceiling vent of your grow tent is also highly effective at reducing heat. After all, heat always rises to the top.

You could also use a cooling humidifier which reduces temperatures while boosting humidity levels. Just take care that the humidity does not increase too much for the growth phase. Remember, seedlings need higher levels of humidity than vegetative marijuana plants, for which 40 percent is optimal.

How useful was this post?

Click on a star to rate it!

Average rating 3 / 5. Vote count: 1

No votes so far! Be the first to rate this post.