
Diatomaceous earth consists of fossilized remains of diatoms, a type of hard-shelled algae. There are a number of varieties, one freshwater diatomite mined in Denmark and often referred to as Danish Pink is used in cat litter which in turn can be used as a bonsai growing medium.
It is also used as a growing medium in other potted plants.
Bonsai enthusiasts use it as a soil additive, or may even pot a bonsai tree in 100% diatomaceous earth. Like perlite, vermiculite, and expanded clay, it retains water and nutrients, while draining fast and freely, allowing high oxygen circulation within the growing medium.
More Info
Diatomite is mined at a few European locations and for a while Diatomite was mined at a location in Skye off the west coast of Scotland. Read about it here.
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