One simple homemade potting soil recipe consists of equal parts peat moss, perlite, compost and garden soil. Optional additives include one handful each of garden lime, soybean meal, rock phosphate and kelp meal. These additional ingredients ensure a year or two of healthy soil without the need for extra fertilizer. Moisten the ingredients for easy mixing, and sift the mix through a 1/2 inch mesh screen. After they are thoroughly mixed, the potting soil is ready.
An easy potting mix for woody plants and perennials consists of equal parts peat moss, composted bark, compost, sand and perlite. Add more perlite if it ends up clumpy, and use extra compost and bark if growing more mature plants.
Another homemade potting soil recipe includes 1 part pre-soaked coir peat, 1 part grade 3 vermiculite, 2 parts sieved compost and 1/2 to 1 cup worm castings or humus. Mix the ingredients, and test the pH, aiming for a pH of 6.2 - 6.8. Add 1 - 1.5 grams of dolomite per liter if the mix has a low pH, or .3 grams of sulphur per liter if the pH is high. Keep the mixture moist, and check the pH again in a few days.