Hi, My container kumquat tree has been flourishing for 4 years. Right now I have about 50 fruits on it in various stages of growth (I know that's not good, but what can I do :) ? But recently I noticed that some of the maturing fruit is turning hard and dark as shown here. It's almost as if it's petrifying. Does anyone have any idea what's causing that? I have a lot of fruit that's about to start maturing, my best crop yet. Help!
Sorry, I should have mentioned that I'm in Miami and it's hot here but the plant is absolutely thriving except for this problem.