I have the same issue, i suspect my problem is to much cal. I have hard water, dont know how hard as im doing a poor man grow. No meters no ro. Just me, my best guess and litmus paper.
If i had to guess, im guessing my starting water is around 400ppm. Its actually wrecking hotwater tanks in the area as the city switched to well water vs lake fed.
It's funny when I joined this forum I was making fun of the overuse of calmag and how its offered up as a cure all, and ever since I keep seeing legitimate calcium issues and recommending calmag lol.
It's funny when I joined this forum I was making fun of the overuse of calmag and how its offered up as a cure all, and ever since I keep seeing legitimate calcium issues and recommending calmag lol.
With excess usually really dark older leaves can be waxy (before they turn) same rust colored spotting, you'll also start seeing other deficiency as other nutes lockout.