Vermiculture, or worm castings, are a natural, organic fertilizer that improves soil structure, texture and aeration, increases the soil's capacity to hold water, and provides a nitrogen-rich fertilizer. Worm castings are beneficial to house plants, being much more nutrient-rich than potting soil. They add beneficial organisms, nutrients, trace elements and enzymes to the soil that sustain healthy plant life and vital plant growth. Re-potting house plants with potting soil made with worm castings will produce stronger, healthier plants.
Fill a large bucket or plastic bin about one-quarter full with potting soil. A container with a lid works best, so you can store your enhanced potting soil in it until you are ready to use it.
Add an equal amount of peat moss to improve aeration and increase humus content. Peat moss helps to keep plants moist, functioning similarly to a sponge by soaking up moisture and releasing it slowly, as plants need it.
Add an equal amount of builder's sand to ensure good drainage. Container plants are especially susceptible to soggy feet, which occurs when pots do not have proper drainage.
Add an equal amount of worm castings to boost the amount of nitrogen and other nutrients that will be available to your plants. Be cautious not to use too much. Ellen Sandbeck claims, "Vermicompost is concentrated, and considered by many to be nature's most perfect fertilizer. As such, it should be used as fertilizer, not compost, and used sparingly.
Mix the ingredients thoroughly. Use for re-potting container plants and watch as they flourish.