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why do cannabis seeds not fully germinate

If you allow your seeds to germinate for too long, transplanting them safely will become difficult. The reason for this is that the longer the roots are exposed to air and light, the more likely they are to become damaged. Moreover, the longer the taproot, the higher the risk for accidental damage when transplanting.

Handling your cannabis seeds with bare hands can contaminate them with all kinds of nasties like bacteria and fungus. Unfortunately, seeds and seedlings are especially vulnerable to these types of harmful pathogens.

Unless you are using cuttings, growing weed starts with germinating your seeds. If your seeds don’t sprout, for whatever reason, your grow will be over before it even has a chance to start. But If you know the reasons behind germination problems, your chances of getting your grow off to a great start will greatly increase!

9. ALLOWING SEEDS TO GERMINATE FOR TOO LONG

Do your due diligence and verify when local temperatures are high enough to set your plants outside. Usually, waiting a couple weeks for higher spring temperatures is worth it!

Likewise, if your seeds are too close to the surface, there is a risk they’ll dry out before sprouting, or the seed will emerge but can’t shed off its cap. The happy medium is to place your seeds about 0.5–1.0cm deep and just lightly cover them with soil.

Keeping the above in mind, seeds do need moisture to germinate. Keep your soil moist but not damp. The best approach is to use a hand sprayer with a fine mist setting. Use a transparent germination hood or cling film to keep the soil from drying out.

Got a bag of “mystery seeds” from your local source or “bargain seeds” from an unknown vendor off the internet? If so, chances are they won’t germinate. Reputable seed banks like Royal Queen Seeds will always test their seeds for quality and germination rate.

Second probability is that the seeds are damaged from frost.

Other factors:

Many growers make the mistake of thinking that they need a high ambient humidity for germination or seedlings. The high humidity and lack of fresh ventilation quickly causes fungus in the soil or growing medium and the seeds rot!

Poor germination results can only be the result of negative outside influences after purchasing the seeds and are beyond our control. This does not necessarily mean that the grower is at "fault". Even the most experienced grower can run into unforeseen problems such as fungus infected soil, a technical malfunction on an EC meter, etc. Often growers buy the wrong soil because it is recommended by the manufacturer or retail store (consult our Soil Guide for more info).

In addition to the germination rates we also control other important factors of quality such as a high level of healthy seedlings. Seedlings should not appear crippled, feeble, tiny, with dehydrated leaf tips, etc. However, this is a biological product and despite the best production methods a minor % of seedlings (calculations based on 100+ seeds) may not appear healthy and need to be removed. It is therefore always best to germinate an extra seed or two as a back-up, especially if you are only growing a few plants.