Liquid Black Crystal (0 - 0.04 - 0.06) assists in increasing the ion exchange across the root membrane. It improves the plants ability to absorb nutrients. 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. Liquid Black Crystal can be used for gardens and lawns, particularly where the pH of the soil is high.