Plants grow best in potting soil that is neither too dense, nor light. Match the best type of potting soil for the specific plant. Potting soil functions best without the addition of drainage matter, sand or layering the bottom of the container or growing area with rocks, according to the Virginia Cooperative Extension.
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Lisha Smith writes for several blogs and has freelanced for six years. She has a Bachelor of Arts from UNC-Greensboro in psychology. Smith has self-published several books. Her areas of experience include gardening, cooking, home improvement, pets and mental health.