Book 29, Question 20
What is the difference between garden soil and potting mix?
Garden soil is heavy and full of minerals, clay, and tiny creatures.
In a pot it can pack down and drain poorly. Potting mix is light and fluffy, made from ingredients such as peat or coconut fiber, bark, and perlite. It holds air and water in a pot. It often has little or no real soil, so gardeners add fertilizer or compost for food.