Answer: Soil-less potting soil can be one of a number of mixtures of sterile "non-soil" materials. The ingredients most commonly used in these mixes are vermiculite, perlite, peat moss, and bark. The important advantages to using a soil-less mix are that theyare sterile (no parasites, bacteria or disease causing organisms), they hold water, yet drain well avoiding damping-off, a disease that often attacks new seedlings. It is most useful for starting seeds. These "soils" are available at any garden center and are also called seed starting mixes.
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