The soil is an organic super soil (http://forum.grasscity.com/organic-growing/1332892...). This is the second round with the same recipe. The first went through without a hitch, this time around though, 2 weeks into flowering, the serrated edges and leaf tips are browning (rusty brown) and curling. Temp ranges from 80-90*F and there have been some thunderstorms lately. Managed to bring them under a shade for the most part but they've been left out through some light drizzles over 3-4 days. Any help would be greatly appreciated.
I don't know about nute burn. The mix is organic and properly aged. Everything has had about 2 months to cure and cycle down before any plant was introduced to it. I did add a very small amount (tablespoon) of Jamaican Bat guano in the flowering stage, but really saw no adverse affect in the plants till the thunderstorms hit.
Anyone else want to take a swing at this? Gave it a liquid Kelp foliar this morning to cover possibility of heat stress