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RayR · February 27, 2012

Coarse ground freshwater DE works fine as a soil amendment. I've been experimenting with it myself in potted plants. It has a PH of about 7.0, it holds water and nutrients well, it doesn't break down, it is mostly insoluble silica but has some soluble silica and trace minerals as well.
Some Bonsai enthusiasts use it as a growing medium. Read here

I even did an experiment last month germinating onion seeds in coarse ground DE and the seedlings have thrived, no different than those germinated in seed starting mix.

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February 27, 2012	#18
RayR Tomatovillian™ Join Date: Jun 2010 Location: Cheektowaga, NY Posts: 2,466	Coarse ground freshwater DE works fine as a soil amendment. I've been experimenting with it myself in potted plants. It has a PH of about 7.0, it holds water and nutrients well, it doesn't break down, it is mostly insoluble silica but has some soluble silica and trace minerals as well. Some Bonsai enthusiasts use it as a growing medium. Read here I even did an experiment last month germinating onion seeds in coarse ground DE and the seedlings have thrived, no different than those germinated in seed starting mix.