ANC
Well-Known Member
Foliars should be applied at low ppm levels, they are mainly useful when you mess up your roots (leaves look less than perfect). They provide another vector for nutrients to get where they are needed as a top-up to what the root is able to provide. Even plain water foliar can be good if things run hot and humidity low. Fertiliser aside, the difference between a healthy leaf and a dying one is that the healthy leaf is colder than the surrounding air. A water foliar can act as a crutch in extreme conditions. You MUST have enough airflow to dry things up again.