Foliar feeding is a process that involves using a sprayer and spraying the marijuana plant leaves directly with diluted fertilizing solution instead of watering and fertilizing just the soil. With soil fertilization, soluble substances taken up by the plant together with the nutrients the plant is after are thought to be more than when you just spray the leaves. While it is an older method of fertilizing plants, it is for this reason that foliar feeding is fast becoming more popular in grow ...