If you think its just calcium some simple "cal mag" could do it, a lot of companies make this, I use botanicares. like $20 for a liter or $50 for a gallon at a hydro spot. I actually had the same thing myself just last week, but I usually give half veg, half flower nutes last week of veg, I didn't this time because I completely switched my nute lineup and my veg and flower nutes weren't the same so I was unsure of how much to give, but once I gave it the first full flower dose of nutes, it stopped.
steezyd Reviewed by steezyd on . Plant has brown rusty spots on fan leaves any suggestions both my plants i have noticed have theys rusty looking spots on them . I am a newish grower i grew a crop 3 plants a few monthes ago with no problems at all. theys two plants i have now basically look like when your plant gets water on the leafs and the water magnifies the light and burns teh leaf. but all over the the fan leafs on most older fan leafs. any help would be appreciated. I have a black berry plant and a tangerine dream under a 250 watt HPS just switched to 12/12 yesterday in soil Rating: 5