Measure the ingredients and add them to a glass bottle or jar with a lid. Stir well to combine and shake well before each use.
Dilute the fertilizer by adding ½cup (120 ml) or the liquid fertilizer blend into 4 cups (950 ml) of water in a watering can. Water houseplants with the diluted fertilizer mix monthly in spring and summer and discontinue use in fall and winter.
Use the diluted fertilizer immediately. The prepared fertilizer can be stored in a cool, dark location for up to 3 months. Discard if the liquid shows signs of spoilage such as discoloration, mold, or an unpleasant odor.