 so yes toms do work you need 80 of them per plant but the much cheaper alternative is just to simply water consistently and if you really are concerned there are certain areas where calcium deficiency is a real thing and not a made up i saw it on the internet so i got to do in my garden you get a soil test from soilsavvy.com they'll give you 16 points of analyzation to tell you what you have and what you don't have and how to get what you need in order to have a healthy garden