From a precision point of view my approach to foliar feeding is a nightmare – it is more like cooking. I have some modules of KNF, then I use green-tea, the liquid of Baresa black olives (has a lot of iron gluconate in it), sometimes Mg-citrate, molasses, herbal teas depending on what I want to achieve.

Here Boron, Iron and Mg are often a problem, so I look at these and try to raise plant happiness in general.