Hello,
I have semi-dwarf green gage plum tree I planted 4 years ago. It grows like crazy, gives me a lot of new very long shoots every year and it showed me 3 flowers for all this time - first two in 2011 and another one in 2013. This is it. I prune it in June, trying to keep it vase shaped and not very dense, but by the fall, it grows twice more shoots that I pruned, and grows them high. On the picture the tops of the shoots didn't fit the frame. I do not fertilize it , other then some compost mulch 2 years ago. Also it is growing in location that gets about 6-8 hours of direct sun - one hour in the morning, then it is about 5 hours of not too dense shade from a big tree behind the house(far from the plum tree) and then some shade from the house and then it is the sun for the rest of the day when the sun comes up high then the house. The question is - is there any technique to promote flowering, or the growing condition is not good for it and It will not flower in this location?