Using Compost in Potting Mixes
Sifted compost can be used as part of a potting soil for use in planters, house plants or starting seedlings in flats. Compost is a good component in potting soil: it stores moisture and supplies nutrients not found in sand, bark, peat and pumice.
For starting and growing seedlings in flats or small containers:
- Sift compost through a 1/2 inch mesh.
- Mix 1 part sifted compost, 1 part coarse sand and 1 part Sphagnum peat moss. Add 1/2 cup of lime for each bushel (8 gal.) of mix. Use liquid fertilizers when true leaves emerge.
For growing transplants and plants in larger containers:
- Sift compost through a 1 inch mesh or remove larger particles by hand.
- Mix 1 part compost; 1 part ground-up bark, Perlite or pumice; 1 part coarse sand; and 1 part loamy soil or peat moss. Add 1/2 cup of lime and 1/2 cup of 10-10-10 fertilizer for each bushel (8 gal.) of mix. (An organic fertilizer alternative can be made from 1/2 cup bloodmeal or cottonseed meat, 1 cup of rock phosphate and 1/2 cup of kelp meal.)