Below is a list of ingredients that Violet Voice growers have used for a potting medium.
Alfalfa Meal - fertilizer
Bark - Aeration; some water-holding capacity. Decomposition may remove nitrogen
Bat Guano - fertilizer
Blood Meal - Organic source of nitrogen
Bone Meal - Organic source of phosphorus, calcium and a little nitrogen; makes soil less acidic
Calcined Clay - moisture retention, drainage, aeration and promote root penetration in heavy clay soils
Charcoal - "sweetness"/freshness of soil
Coir - moisture retention; does not break down
Compost - water retention, anchoring, and nutrients. Quality can vary greatly depending on source. May contain beneficial soil bacteria, as well as harmful ones
Cottonseed Meal - Organic source of nitrogen, lesser amounts of phosphate and potash; acidifies soil and stimulates beneficial bacteria
Decomposed Granite - aeration
Dehydrated Cow Manure - fertilizer
Dolomite Lime - Provides calcium carbonate and magnesium carbonate, elemental calcium and magnesium; corrects overly acid soil. Not useful if hard water is used.
Egg Shells - nutrients, esp. calcium
Fish Emulsion - fertilizer
Granite Chicken Grit - aeration
Green Sand - AKA the mineral glauconite, source of potash, iron and other minerals (phosphate, calcium, magnesium, sulfur, boron, manganese and zinc).
Kelp - fertilizer
Marathon - systemic insecticide ( Imidacloprid )
Peat Moss - add some wieght to soil when wet; holds water; difficult to re-wet when dry
Perlite - for aeration; does not absorb water; According to Rob's Violet Barn, up to 50% perlite can be used when wicking
ProMix - Commercial soiless potting medium containing mostly peat and perlite
Pumice - aeration
Sand - weight; does not absorb water but holds it between grains; formerly used often to start leaves
Styrofoam - for aeration; does not absorb water
SuperPhosphate - Provides phosphate, good for roots, stems, blooms and fruit.
Vermiculite - increases aeration; absorbs some water
Vinegar - mainly added to water; makes more acidic/corrects alkaline pH
Worm Castings - fertilizer
Compiled by Rebecca.