I'm such a novice
pruner, having only dabbled in in for the last three years and only
really seen the results of my pruning this year. I figure in
about a decade, I'll feel like I've got my feet under me. In the
meantime, I cut and hope.
I'm pruning all of my fruit trees to one of two forms --- the central
leader system (apples, pears, cherry) or the open center system
(peaches, nectarines.) Since I pruned most of my apple trees in
February, I'm focusing on the open center system here, which is a lot
more difficult for the novice, in my opinion. The purpose is to
keep the tree short and spreading so that the maximum amount of
sunlight reaches the leaves and fruit (and the fruit is easy to
pick.) Unfortunately, this pruning technique goes directly
counter to a tree's natural growth system --- straight up.
Last year, I skipped the
training stage, assuming that if I pruned right, the branches would
stay at an optimal 60 degree angle to the trunk. Wrong! As
a result of my lack of training, I had to chop the tops off of two
trees, which will probably set them back in their bearing a bit but
which will hopefully bring them long term health.
So, what's the right
way? First, identify three to five main scaffold branches spaced
at least three inches apart along the trunk and reaching out in
different directions (making a spiral when seen from above.) Now,
train the scaffolds to a 60 degree angle from the trunk. I've had
good luck with tying young branches down to screws in the side of my
raised bed frames.
On a big tree which wasn't
trained properly the previous year, you might
have to tie sub-branches on these main scaffold branches down
separately. On the left, you can see our oldest peach tree which
has grown out beyond the limits of its raised bed and had to have its
branches tied down to bricks. Notice particularly the scaffold
branch on the right which wasn't trained last year, so ended up growing
vertical. I'm trying to pull it back down to a better angle, but
the crotch is never going to be the optimal 60 degrees!
Only after all of the scaffold branches are trained into place should
you start pruning. Before your peaches start bearing, you should
prune the bare minimum, which is still a lot if you didn't train well
the previous year. Cut off any branches on the main trunk except
your scaffold branches, lop off any twigs/branches shooting straight up
("water sprouts"), and in general make sure that none of the branches
cross over another branch. This is where pruning leaves the realm
of science and enters the world of art --- an art which you don't see
the results of for a couple of years at least! I hope you learn
from my mistakes and do a better job on your peaches than I did on
mine!