Zonal Geranium and leaf-color changes?
I'm new to growing Zonal Geraniums. They are doing well as far as being outdoors and are in pots right now (potted up from their 4" nursery pots), but in the last few days I noticed just one of the Pinto Red has some leaves that are turning a funny color, yet not as dark as the deep purple rings..more a dirty brownish purple. What would cause this? I was thinking cool soil since many plants get that purplish/reddish thing going on for lack of phosphorus until soil warms up, but it's just the one pot.