Liquid Black Crystal is a humic blend that assists in increasing the ion exchange across the root membrane. It improves the plants ability to absorb nutrients resulting in better plant growth. Liquid Black Crystal must be put into your reservoir or used as a soil drench. It is most effective when it is applied to the root zone of a plant. DO NOT foliar spray with Liquid Black Crystal. It can be used for gardens and lawns, particularly where the pH of the soil is high.