Thanks for your reply.
I haven't tried any salts or magnesium but I did try Osmocote which I suspect might be the reason of the red spots, but regardless they have been growing for years and the same thing happens, and the big leaves die off and no further growth is acheived.
I thought maybe coffee grinds might change the acidity of the soil but I read that somewhere and I suspect acidity might be an issue. The ones you see in the pictures have just been transplanted from their original location infront of the house. My location is South Florida.
