Wiggle worm soil Builder pure worm castings are surely Mother Nature's best kept growing secret. You need only use a small amount in or around your houseplants, vegetables & flowers. The miracles of the earthworm are easily seen in the beautiful growth & yields of your plants. The nutrients in earthworm castings are plentiful. Most importantly, these nutrients are perfectly balanced in two forms. One form can be immediately absorbed by the plant as if it were directly injected & the other form is able to provide Nutrition which slowly feeds the plant for long periods of time. This makes Wiggle worm soil Builder very cost effective because small amounts provide incredible results & last a long time.