Soils for growing African violets need to be loose and well-draining. Excellent plants may be grown in a mixture of equal parts sphagnum peat, vermiculite and perlite. The soil mixture should also be slightly acidic (pH 6.0 to 6.5). A good potting soil for African Violets actually contains no soil at all. Potting soil needs to be very light and porous. Which will enhance aeration and keep the soil moist, not soggy. The pH of a potting soil is important, because if it is too high or too low, African Violets can not properly absorb nutrients.