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In nature, weather, gritty soil, and even acid in the digestive tracts of animals abrade the seed, letting moisture in to spark germination.
Some hard-shelled seeds, such as sweet pea and balloon vine, benefit from the outside coating being scratched or nicked to speed germination. One easy way to scarify seeds is to rub them lightly between two pieces of fine sandpaper. Abrade only the ...
It is also effective if the pests consume it, since it will abrade them internally, causing eventual death as well. A mask should be worn at all times when working with DE, because it is very irritating if inhaled.
 See also: Plant, Water, Soil, Growing, Planting
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