What Is Diatomaceous Earth and Where Does It Come From?

Diatomaceous earth (DE), or diatomite, is a natural powder made from a sedimentary rock that growers use as a soil additive and organic pesticide for cannabis. It forms from diatoms, single-celled algae that pile up in lake and ocean sediments as they die; over time, those fossilized organisms build up into diatomite. Ground into a fine powder, it's a handy amendment and bug killer for weed grows.

 

How and When Should You Use It?

You can work this sedimentary rock into your cannabis plant's soil or growing medium.

It's deadly to creatures with an exoskeleton and kills insects like ants, bedbugs, fleas, cockroaches, mites and aphids, because it strips the waxy, oily layer off their outer shell and they dry out. Go for food-grade DE and try not to breathe in the dust.

You can also apply it as a foliar spray by mixing diatomaceous earth with water. The ratio depends on each brand's instructions. Shake the mix well and spray the plants with a thin, even coat on both the tops and undersides of the leaves. You want the leaves wet, but not dripping.

This method should only be used on plants in veg through pre-flower. If you use diatomaceous earth during flowering, you risk the buds holding on to the product, and then you'd end up smoking or eating it. Once the spray dries, the diatomite becomes active and starts working.

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