Hi All, I have a small orchard of semi-dwarf fruit trees that need to be pruned for the first time. They are on semi-dwarfing rootstocks. It is dead of Winter here, and very cold, so it's a great time for me to go out there and do the work. Anyways, it's one pie cherry, 2 apricots, and 7 various American plums. The Toka semi-dwarf plum went nuts, tho, and is quite large, it dwarfs the other trees. I don't know why. I also have 3 bush cherries and 2 Manchurian bush apricots, and 8 semi-dwarf apple trees. How much do I prune back the new growth? I know how to do the apples, but the rest, no... Or should I be more severe since I haven't pruned them at all and Summer 2012 was their 4th growing season? They are thickly branched and very healthy, growing like weeds. Thanks for your help!