that neem is garbage order ahimsa Indian neem oil from either build a soil or neem resource. if you want quality organic neem. Aside from neem having azadiractin it also has phos, nitrogen, potassium, iron, sulfur, magnanese, magnesium, calcium, and copper
with any neem use less than the directions say. Oils can clog the stomata and suffocate the plant. Use a an emulsifier - yucca extract or castile soap or aloe vera . Silica is a horrible emulsifier.
for the soil you can top dress ahimsa neem cake. but you wan to top dress worm castings and compost on top of any amendments to break them down faster.