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seed split in half weed

Most grow techniques that involve stress work on the same principles; stressing a cannabis plant encourages it to take up more nutrients, which in turn results in more vegetative growth and heavier harvests.

Stem splitting is a very aggressive grow technique that’s generating a lot of discussion in the cannabis cultivation community. Those in favour of this technique argue that it stresses the plant in a beneficial way, forcing it to take up more nutrients and produce bigger, more potent buds. Could this be true? Keep reading to find out.


Splitting is a really aggressive high-stress technique, and we only recommend it to experienced growers. Also, we do not recommend stem splitting on autoflowering strains, as it can be far too intense for them.

The theory behind stem splitting is no different. However, it’s a lot more controversial than other high-stress techniques such as topping, fimming, or super cropping. After all, taking a knife to the stems of your flowering cannabis plants is pretty hardcore.

Taking a knife to your cannabis plants a few days before harvest seems pretty counterintuitive. However, many growers say stem splitting can produce bigger yields and more trichomes for tastier, more potent bud. Read on to learn more.

This is usually caused by a fungal disease called "damping off". The cause is infected soil, waterlogged substrate, high humidity. any conditions that promote fungus. The fungus attacks the soft tissue in the stem which withers at the base or midway. The seedling collapses and dies. Another possible cause is that the seedlings died from lack of water or a high salt level in the substrate (which basically has the same effect of drying out the plant). Seedlings have only a small amount of roots and few leaves. They cannot retain much water and quickly dry out. High humidity in the grow space does not compensate for a desiccated substrate. Your soil/rockwool has to be moist enough to sustain healthy roots and provide water to the plant. Photo shows “damping off”.
Outdoor frost can kill seedlings overnight. Keep your seedlings indoor until there is no danger of sudden frost. See our GERMINATION GUIDE for great product tips on how to keep your seedlings warm outdoor or in the greenhouse.

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Seedlings cannot open their first set of leaves

Germination Instructions

Please read our Germination Instructions before germinating your Mandala seeds. Due to the high quality and fresh stock of our seeds we advise against soaking the seeds in water or germinating in paper tissue. Germination results will vary when pre-soaking seeds. Fresh seed stock can germinate under these conditions, but not always. Most often, only pre-germinating in moist paper tissue works for fresh seeds. But this is also not full-proof and should only be done if you have enough seeds to spare.


A very small percentage of plants turn out to be triploids (ie. have three sets of leaves) among thousands of specimens. This does not impair plant health and is a feature unique to cannabis as a plant species (ie. not restricted to our genetics). For more info on triploids please see our FAQ. Also very rare, but not a reason for concern, are twins. These appear when there are two embryos in one seed. If both seedlings are the same size you should separate them quickly before roots get entangled and then you have two plants for the price of one! If one seedling appears inferior just remove it. If a seedling has fused cotyledon leaves or a young plant has fused leaf tips on a leaf this is nothing to worry about and it has absolutely no impact on growth or flowering. Nature is always trying out new combinations and that cannot be prevented in selective breeding.