How to Make Potting Soil Ingredients 1 bucket (2-½ gallons) peat moss 1 bucket (2-½ gallons) vermiculite or perlite 1 half bucket (1-¼ gallons) screened compost or composted cow manure 2 cups fine sand 2 cups pelleted time-release fertilizer ½ cup lime (to counter the acid of peat and keep the pH level near neutral) Instructions Mix thoroughly. Makes enough to fill two 14-inch tubs or five 12-inch hanging baskets. Double or triple recipe for bigger containers.