Homemade Fertilizers for African Violets

Worm Castings

• Earthworm excrement, or castings, contain levels of nitrogen, phosphorus and potassium up to 11 times higher than levels present in ordinary garden soil. Plants must metabolize these essential N-P-K nutrients to sustain healthy growth. Castings contain other nutrients, found in earthworms' digestive secretions, that also contribute to the vitality of plants.

  As an organic amendment, they are nontoxic and nonburning to plants. Earthworms in homemade vermicomposters digest certain kitchen scraps that reward gardeners with a free, odorless, organic fertilizer for African violets.

Phosphorus for Flowers

• Flowering houseplants benefit from additional phosphorus. Bat guano is available commercially, packaged either as a high-nitrogen or a high-phosphorus source, depending on its processing method. The high-phosphorus source is an excellent choice for flowering plants.

  Although it is expensive as a landscape fertilizer when applied over large areas, a little goes a long way with houseplants in small containers. A scant 3 tsp. of guano mixed in 1 gallon of water makes an excellent organic, homemade, liquid fertilizer for flowering plants.

Milk and Juice

• As a specialist in soil fertility, Dr. Joseph R. Heckman knows the benefits of building soils to build healthy plants. According to his article in "Mother Earth News," Dr. Heckman uses only diluted milk and juice for fertilization. Before recycling milk and juice cartons, he rinses them with water and uses the liquid as houseplant fertilizer.

  Milk contains nutritional elements of nitrogen, phosphorus and potassium, and juice packs an extra punch with its potassium benefit. This combination of nutrients provides a balanced houseplant fertilizer that is organic and homemade.

Micronutrients

• For optimal health, plants also need trace amounts of vitamins, minerals and amino acids. Seaweed contains these essential micronutrients, which are often deficient in other fertilizers, plus natural hormones that encourage plant growth. Mixing 1/2 tsp. of sea kelp meal in 1 gallon of water provides important nutrition to African violets.

  A combination of bat guano and sea kelp, plus milk and juice residuals, provides a nutrient-rich, organic source of homemade fertilizer for African violets.