@ 1939bear
Well calcium is needed throughout the plant's lifespan, from beginning to almost end cannabis wise. Maybe your water source has plenty in there as I'm using distilled water or maybe your soil if that's what you are using has plenty available or your bottled nutes if that's what you are using contain enough..This plant is in used Roots organic and I didn't add enough sources of calcium or magnesium to the mix...So between distilled water that has to be remineralized, a half ass depleted soil, and sitting under two cobs as she grows faster and faster the need for these minerals becomes greater.She only gets water, Mammoth P and organic cal/mag, everything else relies on what I threw in the mix and top dressings.