I had to go by the hydro store today and I asked my buddy there about calcium and bud rot. He disagreed with bbp about it. He said that calcium does help with blossom end rot, which is caused by a calcium/mag. deficiency. Bud rot is botrytis and calcium won't help it. He mentioned a product called Excel? for it. It is a systemic that you put in water and give to the plant through the soil BEFORE you get the rot. Once a month. I will look into it for next year. He suggested that if the plant was in the 2 week harvest window to just harvest it, rather than risk losing more to rot. I trust him. Just thought I would pass it along. Bud rot is a big deal for me and I would love to find some kind of answer, if not an actual solution. I am not saying bbp is wrong, just giving another opinion.