Potting soil for garden plants is measured by volume, starting with the feet for large quantities, the dry gallon for moderate quantities along with the dry quart for small quantities. It doesn’t, while you would think a pot would require 4 quarts of potting soil that is sterile, there being 4 quarts to the gallon — it require 3 quarts.
Three Dry Quarts
Flower pots for garden plants arrive in many different sizes, together with the 1-gallon size a popular selection for many species of flowers and plants. Filling a plant kettle takes of potting soil, 3 quarts. A typical 1-gallon plastic flower pot measures 6.5 inches in diameter and 6.5 inches high. Three dry quarts is equal to one-eighth of a cubic foot. S O 1 cubic foot of potting soil will fill about eight pots. A 12-gallon pot will require 1.5 cubic feet of sterile potting soil.