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best temperature to germinate cannabis seeds

Best temperature to germinate cannabis seeds

  1. 250 ml of Seedbooster is exactly enough to germinate ten seeds. Pour it into the measuring cup, taking care to use the exact quantity for the number of plugs. For example, if you want to germinate five seeds, only use half the Seedbooster.
  2. Then add 125 ml warm water (for every 125 ml of Seedbooster). Place the germinating plugs in the container and carefully pour the mix over them, so they will directly absorb the nutrients. Wait a few minutes until all dampness is absorbed. Then, making sure your hands are clean, carefully place your seeds about 5 mm deep in germination seeds. Do this extra carefully and make sure you don’t apply too much pressure on the seeds.
  3. Now place the cover on the box, closing it tightly. This helps create the best climate for germinating, and the seeds should grow more quickly. Keep the container in a warm room, at a temperature of about 20°. Wait five days for germination, then turn the cover 180° in order to create a small opening that allows the plants to breathe fresh air.
  4. Make sure there is always plenty of natural or artificial light. You’ll obtain the best results with fluorescent lamps. (Coolwhite – colour code 33 – gives optimal results).

Sprouting Marijuana Seeds

There are several possible ways to germinate Cannabis seeds; here we describe the most important ones. At Royal Queen Seeds, we only sell feminized cannabis seeds, so it’s not necessary to eliminate male plants.

Things to know in brief

  • The ideal temperature is between 22° and 25° Celsius
  • The ideal air humidity is between 70% and 90%
  • The environment must be damp but not wet , because that slow the plant’s growth
  • Fluorescent lighting is the most favourable for germination ( Coolwhite code 33 )
  • Touch the seeds as little as possible with your hands
  • In hydroponic/rockwool plugs, the ideal PH value is 5.8 – 6.2

Germinating with Royal Queen Seeds Easy Start Kit

Germinating with this kit is perfect for a beginner grower who wants an optimal germination for his cannabis seeds.

The Royal Queen Seeds Seedkit contains * :

  • 3 x feminized RQS White Widow seeds
  • 1 x Seed Growing tray with transparent cover
  • 10 x Seed Germination Plugs
  • 1 x Bottle of Royal Queen Seeds Seedbooster (250 ml)
  • 1 x Royal Queen Seeds catalogue
  • 1 x Instruction manual

* You will also need a measuring cup and a stirrer (not included in the Seedkit).

  1. 250 ml of Seedbooster is exactly enough to germinate ten seeds. Pour it into the measuring cup, taking care to use the exact quantity for the number of plugs. For example, if you want to germinate five seeds, only use half the Seedbooster.
  2. Then add 125 ml warm water (for every 125 ml of Seedbooster). Place the germinating plugs in the container and carefully pour the mix over them, so they will directly absorb the nutrients. Wait a few minutes until all dampness is absorbed. Then, making sure your hands are clean, carefully place your seeds about 5 mm deep in germination seeds. Do this extra carefully and make sure you don’t apply too much pressure on the seeds.
  3. Now place the cover on the box, closing it tightly. This helps create the best climate for germinating, and the seeds should grow more quickly. Keep the container in a warm room, at a temperature of about 20°. Wait five days for germination, then turn the cover 180° in order to create a small opening that allows the plants to breathe fresh air.
  4. Make sure there is always plenty of natural or artificial light. You’ll obtain the best results with fluorescent lamps. (Coolwhite – colour code 33 – gives optimal results).

Germinating in a glass of water

  1. Place your seeds in a glass or bowl full of water at a temperature of about 20° Celsius. After 3-5 days you should see some tiny white tips, and the seeds should open. These tips are the beginning of the roots; you can remove your seeds from the water when the roots reach 2-3 mm, using extreme care. Now you can move them to soil, to a hydroponic culture or with any other method you prefer.
  2. Make a small hole (5 – 10 mm) and carefully place the germinated seed in its new environment. It’s important not to use too much water; and always use a squirt gun. Make sure the fluorescent light is very close to the plant; a very common error is keeping the lamp too far from the plant. Germinating in water does not, however, yield the best results possible.

Germinating in wet paper towels

  1. Dampen two layers of paper towels with warm tap water.
  2. Place the cannabis seeds between the two layers and check every day to see if they’re damp enough.
  3. In a few days, the seeds will probably have begun to germinate and can be moved to a different environment, provided the new environment is still very damp and sufficiently illuminated.

Direct soil germination

Germinating directly in soil is a very frequently-used technique; it’s not necessary to re-pot your plants, and the more fragile plants aren’t disturbed during the growth process. For this method, it’s very important to use top-quality soil (enquire at your local grow shop about the different types of soil for vases).

  1. Plant the cannabis seed about 1 cm deep in the soil.
  2. Cover the hole with other soil, without compacting excessively.
  3. The soil must be lightweight, in order to allow the plant to sprout easily.
  4. Roots usually have difficulty penetrating solid soil, which in turn slows the plant’s growth.
  5. The cannabis seeds should germinate below ground and sprout after 4-10 days.

With this method too it’s important to place them in a damp and ventilated environment, at the right temperature.

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Best temperature to germinate cannabis seeds
A germinating cannabis seed

5 common mistakes when germinating cannabis seeds

How do we germinate cannabis seeds?

Although the germination of cannabis seeds is a relatively quick and easy process, it is crucial to take into account a series of important factors in order to obtain as high a germination rate as possible. In addition, it’s in our interest that the seeds germinate as quickly as possible, and especially if we want to avoid problems like fungal infection or a low germination rate.

In our article on how to germinate cannabis seeds we explain step by step what you must do to achieve successful germination. Today we will take a look at the main mistakes made during this process, some simple errors that, as we will see, can easily be solved. Let’s see where many growers fail to germinate their seeds, it’s a great way to learn what not to do if we want to make the most of our seeds.

A germinating cannabis seed

Letting the germination medium dry out

By placing the seed in a moist culture medium, it begins a series of reactions that will lead to germination in a few hours or days. Whichever substrate we choose for germination, we must ensure that it never completely dries out, because as the seed stops absorbing moisture, it’s likely that the seed will cease its activity and never germinate.

For this reason, it is advisable to check every day to make sure the germination medium remains moist, especially if a heat source is used to achieve a higher temperature and therefore a better germination rate; the heat will cause the substrate to dry more quickly, something that must be kept in mind to avoid nasty surprises. In case of hydroponic cultivation it is always better to germinate in rock wool cubes, which of course must always remain moist.

The paper towel should never dry out once germination begins

Leaving seeds to germinate for too long

Another common mistake, in this case when germinating in kitchen paper or similar, is to let the seed germinate until the cotyledons appear. If we do this, then the subsequent transplant is very difficult, and it is very likely that we’ll damage the root in the attempt. Additionally, the longer the root is exposed to air and light, the more damage will result, so it is preferable to transplant it before this occurs.

To avoid problems, it is best to plant the seeds when the tap-root measures approximately 1cm, or 2cm at the most. This will make it much easier to transplant and we won’t harm the development of the roots, which can be expand into the new growing medium without setbacks.

Direct germination in soil

This is a common mistake that usually results in non-germination, especially if the substrate hasn’t been previously watered before sowing the seed but is watered afterwards. By planting the seed directly in the substrate, we run the risk of it being buried too deep, made worse when we irrigate the growing medium post-sowing.

To obtain much better results, first germinate seeds in kitchen paper, jiffy pellets or peat plugs used for rooting cuttings and then transplant them to the soil or to a pot once the small seedlings have been born. Another benefit of this method is that we can germinate a large number of seeds in a very small space, such as a small greenhouse, which will make it much easier to provide the correct temperature and humidity.

Temperature and humidity for germination

Cannabis seeds germinate correctly with relatively high temperature and humidity values. It will be necessary, especially during some seasons of the year, to use some source of heat to get a temperature of about 26-28ºC. For this purpose there are many options on the market, such as thermal cables or heated greenhouses. The latter are particularly interesting because they also provide the perfect high humidity environment for seed germination.

The ideal is to maintain the germination medium at about 26-28ºC and at 70% relative humidity. Lower values ​​will result in a slower and less successful germination, while higher values ​​can bring fungal or rot problems.

A heated greenhouse is perfect for germinating seeds

Planting the seed incorrectly

If you look closely at a cannabis seed, you will notice that it has a slightly oval shape, ending in a point at one end and forming a small “crater” at the other end, which is called the crown. When planting your seed (whether it’s a seed that you want to germinate, for example, in a jiffy, or a seed already germinated on kitchen paper that you want to transplant) you must keep in mind that this crown should always be facing upwards.

So, you should plant the seed with the tip down and the crown uppermost and facing you. Once the seed germinates the crown will serve as a hinge, so that the seed will open at the tip and let out the root. In case of placing the seed incorrectly, the tap root will grow upward and the seedling downwards, which should be avoided at all costs because it is likely that the seedling will not be born.

Planting at the incorrect depth

Too often the seed is buried too deep (a problem that we have already seen in case of watering after planting the seed), so the seedling may never emerge. In the other case, if we sow too close to the surface, we can find that the seed germinates well but the stem grows weak, bending and not allowing the seedling to develop correctly.

To avoid these problems it is be best to sow the seed at about 2cm depth. In addition, we can cover the lower stem as the seedling grows, so that it gains stability and produces new roots along the length of stem we have buried. In this way we can accelerate the growth of the plants.

We should plant the seed with the root downwards

Planting several seeds in the same pot

Although it may be tempting, germinating several seeds in the same container is not usually successful. In addition to the difficulty of correctly planting several seeds in the same pot, once they are born they will compete for the little space available for their roots. Having restricted root growth does not suit cannabis plants, which will grow more weakly and with greater internodal distance.

In addition, the scarce space between the plants will also mean they will compete for available light, something not recommended if we want to get the most out of each plant. The plants will produce very little lateral branching, and will center their growth on a weak main stem, with too long an internodal distance, factors that usually affects negatively on the final yield of buds.

We hope that this article will help you avoid problems when germinating your seeds, it can be very frustrating to start a grow with all the enthusiasm and excitement, only to run into problems straight away! Do not hesitate to leave us any doubts, comments or your own tips and tricks, we’ll be happy to answer you.