I've got 3 Shishkaberry clones growing outside since the beginning of May and just in the last week the leaves are turning a bright yellow. Is this normal or maybe I'm over watering since it's been very hot here since May(90's to 100's). They are growing great and are almost 6' tall and looks to be flowering now. Any insight would be appreciated. Oh, almost forgot, I also have a MAC 4 doing the same thing.