English Walnut, when is best time to prune?
I have a large English Walnut. Neighbor complains about shade and it being so big, with limbs over their property line. They want to hack it off. I say I will have it cut back in mid-summer, late July. they say I am crazy because trees have to be pruned before they put out leaves.
I read that English Walnuts' sap flows all year.
If cut while hard freezes can occur (up to end of May in my area) and tree is bleeding, this could cause lots of damage as sap freezes and backs into tree.
I read that it is best to prune a Walnut in mid-july; although sap is flowing, wounds will be better able to heal, because of no freeze damage.
People who prune trees for living, here, as well as USDA extension service, tell me I am wrong. They say Walnuts should be pruned before they leaf out.
What is best?