Starting plants from seed is a lot of fun, but it�s not so much fun to watch them wither and die shortly after germination. One way to gain an advantage is to use a sterile potting mix, because you never know what problems come along with soil from the garden. If you�re going with a potting mix anyway, you might want the further advantages a soilless mix brings. Here�s a rundown on what�s in the potting mix if you leave out the soil, and why you�d bother to in the first place.
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[Source: About.com Gardening: Most Popular Articles]