germinating cannabis seeds light or dark

Cannabis seeds require a specific temperature range in order to germinate. Regardless of the germination medium you are using (soil, paper towels, etc.), the temperature in the environment should consistently sit in the 26–28℃ range. Seeds need to be kept warm during the germination process. At no point during germination should seeds be exposed to temperatures below 20℃.

One of the most common reasons seeds fail to germinate is because they are simply duds. Typically, healthy cannabis seeds should look a specific way and be of a specific colour. Viable seeds will appear round, not flat, and should be a beige to dark brown colour with subtle tiger striping. Seeds that have been flattened or are pale in colour may have a tough time sprouting into healthy cannabis plants.

Once they pop, seedlings are very delicate and must be watered carefully. When germinating, your medium should be damp, but not overly wet for best results. On the other hand, a dry environment is basically a death sentence for your seeds. They need a constant source of moisture to sprout, otherwise they’re good as duds.

TOO MUCH OR NOT ENOUGH WATER.

The amount of water you supply your seeds during the germination process will also affect their ability to successfully germinate. Some growers attempt to germinate by “drowning” them in a glass of water. While this ensures they will not go thirsty, it can actually be more harmful than helpful.

For instance, the upper layer of soil can dry out within 48 hours, making it more difficult to give your seeds the right amount of water they need without overdoing it. Giving your soil too much water during germination could result in the seed rising up or dropping down further, inhibiting its viability. Moreover, seeds that are planted too deep in the soil could experience a host of complications. They could suffocate before coming into contact with enough oxygen, and be unable to access sufficient light to progress into the seedling stage of their life cycle.

Germination is where the magic begins. Cannabis seeds must first germinate in order to sprout and begin their journey as living, breathing plants. However, if the germination process is done incorrectly, or is thwarted by some other variable, seeds can fail to sprout, leaving you with useless, spent seeds instead. Here are the top five mistakes to avoid when germinating cannabis seeds.

Many people choose to germinate their seeds using paper towels. However, others choose to do so directly in soil. Of course, germinating your seeds in soil isn’t inherently bad, but it can come with its own set of challenges, and is generally not recommended unless necessary.

Germinating cannabis seeds is necessary in order to sprout seedlings that develop into mature, healthy cannabis plants. However, complications with light, humidity, heat, and more could result in cannabis seeds failing to sprout. Find out what to avoid to ensure successful germination.

There are some techniques that can be used to ensure your seedlings remain in this temperature range. Some growers choose to use special warming mats that can be set to a specific temperature and placed underneath the seedling containers. Another strategy is to place a timed heater close to your seedlings to warm them up occasionally. Once your seeds have sprouted, they will be much more resilient to fluctuations in temperature.

Generally speaking, seeds require a dark environment in order to germinate. After all, in nature cannabis seeds find their home in the dark embrace of soil. It can be hard to determine exactly how much light is too much for your seeds; however, err on the side of caution and germinate out of direct light. There’s no need to use your grow lights until after germination has occurred.

GERMINATING BAD SEEDS.

It is also likely that the quality of your seeds will affect their ability to handle direct light. Seeds that are already having a tough time germinating will have an even worse time doing so if they are exposed to excess light.

Seeds that have been improperly stored may also fail to germinate. These tiny packages of DNA prefer to be kept in a cool, dark place with moderate humidity. Exposing them to heat, light, or extreme humidity levels (both high and low) could result in seeds losing their viability. As long as you source your seeds from reputable seedbanks and store them appropriately, you shouldn’t have to worry about bad seeds ruining your chances of successful germination.

Seeds may also be unable to germinate if the soil they are planted in contains contaminants. Mould and pests can easily kill a mature, healthy weed plant within just a matter of weeks. It should come as no surprise then that they could also prevent a small seed from germinating. If your soil contains traces of these contaminants, it is possible that your seed will never actually open and sprout. This also applies to fertilisers. Even small amounts of fertiliser in your soil can effectively kill your seed, making it completely useless.

TEMPERATURE PROBLEMS.

Well my argument was that it seems unnecessary and possibly harmful to go through the paper method, putting it in a cup, transplating (some seems to transplant 2-3 times – very stressful to the plant to say the least). That’s a a real hassle when handling a lof of plants.

But yes, each to his own i guess.

You don’t need a black bag over them, just treat them as any old seed and stick them in dirt and wait for them to pop out. There is nothing different about germination of a cannabis seed compared to germination of any other similar seed i.e. klip dagga, catnip, fruit seeds etc.

Light helps lettuce seeds germinate, so why would it inhibit cannabis germination?

I’m with you 100% on this. I’ve never understood why so many people/guides insist on putting seeds in the dark while germinating. There’s no scientific basis behind this. In fact, for many plants like lettuce, light is required for high success rate and speed.

cat of curiosity.

ilyaas123: I’ll leave the bags on for now, the HPS does dry out the top layer quite fast.. and no, i’m not saying the seed NEEDS light, i know it doesnt. Just wondering why total darkness is always recommended in guides.

But yes, each to his own i guess.

For example, if your pulse sequence was [R, FR, R, FR, R], it would be equivalent to [R] since R was the last pulse in the sequence and all the seeds would germinate.

One experiment that’s repeated a lot with lettuce seeds is having a sequence of pulses, either 660nm (R) or 730nm (FR) followed by dark, and what they determined was only the pulse at the end of the sequence mattered. If the last pulse in the sequence was red, most of the seeds would germinate, and if the last pulse was far red, most would fail to germinate.

You do not need lights to germinate cannabis seeds and if you do then it is not at all going to help speed up the process; I mean, how are lights going to help your seed absorb more moisture and root?

With pot, light seems to contribute little to germination success however.

Why is darkness recommended for germination? Doesnt seem to make much sense to me, why would darkness be beneficial to the seed in any way? Just curious. I have some seedlings already but decided to go for a few more plants, so i’ve put the seeds in the pots in the same room, threw some black garbage bags over the pots to avoid some of the light + it add more moisture..

Why is darkness recommended for germination? Doesnt seem to make much sense to me, why would darkness be beneficial to the seed in any way? Just curious. I have some seedlings already but decided to go for a few more plants, so i’ve put the seeds in the pots in the same room, threw some black garbage bags over the pots to avoid some of the light + it add more moisture..

as for germinating, you don’t wait on seeds that don’t germ to sprout. you only plant root tips. for smaller cups, it’s called root building, you get bound in a cup, then transplant larger, to utilize the maximum amount of medium. if you plant in a large container, roots grow to the outside of the pot, then coil, with virgin soil between center and perimeter. big waste, especially if you’re paying for the privilege.

Well-Known Member.

Well my argument was that it seems unnecessary and possibly harmful to go through the paper method, putting it in a cup, transplating (some seems to transplant 2-3 times – very stressful to the plant to say the least). That’s a a real hassle when handling a lot of plants.

I’ve tried germination using a few methods, nowadays i always plant the seeds directly into the large pots. I’ve noticed that it seems to speed up the development quite a bit. I guess it’s becaue it’s much less stressful. I don’t get those methods of first germinate the seed using paper, then putting it in a cup, then moving it to larger puts etc.. that’s seems pretty stupid and is just a hassle imo, the seed and the seedling should be handled as little as possible i think.

Theory aside, I’ve always germinated in the light for years and see no reason not to. I feel like the plant wants to start its life off in the day, and not have an extended period in the dark as its first experience.

light kills roots. end of story.

I usually have 100% sucess rate of germination, so it’s not an issue that some will not sprout. If they don’t no big deal since i always have 2 as back-ups in cups. And yes i’ve also read that it’s important to build a root ball, but i’ve never seen any difference to be honest (i always examine the roots of the finished plants).

catofcuriosity: I’ve heard that too, but a lot of times i’ve germinated seeds in clear plastic cups, the roots has been exposed to my 1200w HPS lights, no problem at all.. The pots i’m using now are of the usual kind (black) and the roots are not exposed to light, but yes it’s possible that light maybe seeks its way through the soil and therefore it could be harmful to the roots..

cat of curiosity.

I’ve tried germination using a few methods, nowadays i always plant the seeds directly into the large pots. I’ve noticed that it seems to speed up the development quite a bit. I guess it’s becaue it’s much less stressful. I don’t get those methods of first germinate the seed using paper, then putting it in a cup, then moving it to larger puts etc.. that’s seems pretty stupid and is just a hassle imo, the seed and the seedling should be handled as little as possible i think.

Tim 2021-05-17 Hi Sean, thanks for your comment. As long as the soil is neither too wet nor too dry, there shouldn’t be a problem with the seeds. They can take a few days to pop their heads up above the surface once they’re planted, the root needs to work its way downwards and find a solid hold to be able to push the seed head out of the soil. Speaking from personal experience, don’t be tempted to dig around looking for them as you’ll probably do more damage than good. The only times that seeds didn’t come up for me were the times I overwatered them, it’s crucial that they get enough air at this moment and too much water can lead to them rotting quickly. Of course, if they totally dry out then they’re not going to survive either. At this stage, I’d just recommend patience, good luck! Best wishes!

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.

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 paper towel should never dry out once germination begins.

Sean 2021-05-17 I had my seeds in the paper towel for 3 days. The tap-roots appeared(not out just showing a bit) and I planted them in the soil. 3 days have past and I haven't seen any progress. Is there a reason why this is happening?

Planting several seeds in the same pot.

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.

Fishnass 2021-08-30 I germinated in paper towel until tap root was as long as seed it curled around the seed anyway my question is if I planted in jiffy pod should I put it under light or wait till it pops up to put it in the light .

Raz 2021-09-08 I have germinated five seeds of different stains, all paper towel method. All sprouted.. All healthy.. All put in good seedling raising mix but the problem is they just sit dormant just not growing. I grow under lights. Last year.. No problems this year no growth. Seeds r less than a year old. HELP.

Tim 2021-11-24 Hi, thanks for your comment and question. The older the seeds are, the less chance they will germinate, and if they weren’t stored in good conditions (dry, cool, stable, e.g. in the fridge) then the chances of non-germination become even greater. You can try a few things to help improve germination rates, for example, the application of fulvic acid and/or gibberellic acid will give older seeds a better chance of germinating. Try germinating a few of the seeds in the normal way and then if you don’t get success I’d look at using one or both of the compounds I mentioned. I hope that helps, all the best!

A germinating cannabis seed.

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.

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 .

Pothead 2021-05-12 This article has a lot of nonsense in it. From Mandala Seeds: A #1 seed killer is a closed humidity dome/mini-greenhouse. Humidity domes are only required for rooting cuttings. Many growers make the mistake of thinking that they need a high ambient humidity for germination or seedlings. This is an unfortunate myth of cannabis cultivation. The high humidity and lack of fresh ventilation quickly causes fungus in the soil or growing medium and the seeds can rot! Cannabis is not an orchid or swamp plant! The seeds need a well aerated growing medium to germinate well. Seedlings also cannot tolerate high humidity and can easily be attacked by fungus such as fusarium and pythium. Only the soil or growing medium should be moist for optimal germination and seedling growth. Ambient humidity is best at or below 50%. Btw, seed should be planted with the pointed end UP, not down. Tap root ALWAYS goes up no matter how you place the seed. It's by the nature, goes against the gravity to create a support for itself so it can push the seed out. It you put it with the pointed end down it will have to make double turn loosing the precious energy stored in the seed.

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.

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.

Leaving seeds to germinate for too long.

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. Cialis for Erectile Dysfunction http://valleyofthesunpharmacy.com/cialis/

We should plant the seed with the root downwards.

Tim 2021-05-13 Hi, thanks for your contribution. Mandala Seeds give some helpful advice but they don’t have a monopoly on germination methods! In my 20 years germinating seeds I’ve tried all different methods and I’ve found good and bad in all of them. except for the methods using moist paper towels, I refuse to use it these days – I found that’s a great way to get mold problems and a really bad start to the plant’s life! That definitely is far too much humidity. as for ambient humidity, we don’t specify anything in this post. What we do say is that the medium in which the seeds are germinating should be at about 70% humidity for the best results. There’s nothing wrong with using a humidity dome or mini greenhouse, as long as you know when to start ventilating. of course if it’s kept sealed all the time then problems are bound to arise! These days I start all mine in a glass of water with a few drops of H202 and then once the seeds open (usually 24 hours) they get transferred to the substrate. As for the point down/point up debate, I think I’ll need to do a side-by-side comparison to settle this in my own mind. I’ve always planted them point downwards or on their side and I’ve yet to see any weird stuff like roots popping out of the surface, or doing a loop-the-loop before the seedling breaks the surface. But it’s clear that the debate needs to be settled so I’ll do an experiment and I’ll be happy to be proved wrong! EDIT: I’ve since germinated over 100 seeds as a test, 1/3 of them went in the soil with the point downwards, 1/3 sideways, and 1/3 with the point upwards. Most of the seedlings broke the surface at around the same time but it’s clear to see that the ones that I’m still waiting for are mostly those that went in with the point upwards. The next step has to be a test in a terrarium so I can actually see what’s going on but I’m almost ready to call complete BS on this “point upwards” theory, FWIW. Thanks again for your comment, all the best!

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.

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.

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. Phentemrine diet pills http://kendallpharmacy.com/phentermine.html.

Tim 2021-09-08 Hi and thanks for your comment. To work out the problem, we need to eliminate a few possibilities. First, check that the temperature and humidity levels within your grow area are suitable for vegetative growth: ideally from 20 to 28ºC with 40-60% RH. Then verify whether your lamps need changing – old bulbs put out significantly less light than new ones, which could be leading to poor growth. If all those factors are as they should be then the most likely culprit is the soil mix itself – the quality can vary from season to season, even with the best brands, so it’s always possible that there could be pests or pathogens in the soil which are preventing the seedlings from making progress. I would recommend trying with a different brand of soil to see if that makes a difference. I hope that helps. Best wishes and good luck!

Direct germination in soil.

Tim 2021-08-16 Hi Master, thanks for your comment. I honestly don’t believe there’s a correct or incorrect way. In our time, we’ve tried germinating seeds point down, point up and also laying them on their side in the soil, and we’ve come to the conclusion that it makes no difference at all – we certainly didn’t see any real difference in the results of one method compared to another. In nature, cannabis seed dispersal doesn’t rely on the seed landing in the soil in any particular position and it’s managed to spread pretty well! That said, if you like to sow your seeds pointy end down, then that’s great, keep doing it your way if it works for you! Best wishes!

Tim 2021-09-01 Hi and thanks for your comment & question. The newly germinated seed doesn’t really need a light source while it’s below the soil surface but as soon as it pops out it will need light to prevent it from becoming stretchy, lanky and unhealthy. For this reason, it’s probably best to keep it under a light with a photoperiod of 18 hours light and 6 hours darkness for the day or two that it takes to break the surface. I hope that helps, best wishes!

Master 2021-08-13 You’re incorrect, seeds should be planted pointy end up crown down.

Jubjub 2021-11-19 Hello Good day I have some that looks like stale might be more than years old seeds. It was a given to me by a friend and I doubt it was preserved properly in proper containers. Will it still germinate?

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.

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.

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.

A heated greenhouse is perfect for germinating seeds.