Advice on pruning sugar maple
I have a sugar maple that is about 20' tall. I am worried that a number of lateral branches are at very shallow angles to the main trunk. I've had larger maples that have these branches ripped off in storms and peel back swathes of bark on the main trunk.... soooo....
Advice on pruning:
1) When? Because they bleed profusely in the spring, I have hear people say late fall/early winter, june, and some just say do in later winter ANYWAY.
2) How much? Is it necessary? (see picture). I would like to take of at least a couple of lower branches because they are in the way while mowing, but they extend up much of the tree and it might look funny. Also there is no clearly dominant leader.