Quote Originally Posted by Shovelhandle
I wish I knew, Retiree.
As I posted, I've had a similar problem and I have a similar grow to yours, good products, proper feeding, lighting temp and pH. One strain hated it and the other strains loved it. I know that a lockout from too much something can look like not enough something. We'll both be happy when we solve this dilemma.
Evidently, the FoxFarm nute schedule is too strong. This type of "burn" happens in every one of my Jack Flash crops. Unusually, it occurs much later in the Flowering cycle as opposed to this time when it started in the 2nd week. The "schedule" was not created for cannabis plants & being that not all plants are created equal, it's entirely possible it's overkill - no pun intended.

I'm going to straight water the next 2 times, then go 1/2 strength on FoxFarm. If anyone has a better way of handling this, I'm all ears.