We have had a potted tangerine tree for two years. It is a dwarf tree, about 4 feet tall. Last year it had two tangerines that were lovely. This year it looked like it was going to have many, 50-60 tangerines that got larger than golf ball size. Everything looked good until about two months ago. The fruit stopped ripening and they have remained green on the exterior and the fruit is sour.
We're not sure if this fruit is past the point of being able to ripen or if we should wait longer. Also, should we prune back the tree and, if so, when?