So I've read a lot of conflicting information on when to prune a River Birch. I have a 3-trunk Clump River birch that has added another 3 trunks (small sucker saplings about 8" tall) that are starting to sprout up from the root system. I planted the River Birch in the late Spring and it has sprouted a lot of new foliage and seems to be thriving. However, some branches are growing all over the place and I am fairly sure I will have to prune off those 3 new River Birch saplings that are growing from the root system. The 3 main trunks for this River Birch are about 6-ft tall, so it's probably a few years old.
The question is, when should I prune this thing? From what I've read, Winter is usually the best time to prune trees, when they are dormant. However, I've read in a number of places that Birches will "bleed out" during dormancy, so Winter pruning can have a negative impact on Spring growth. Some articles appear to recommend a late Spring pruning for Birches, after the leaves have fully blossomed. Problem is, that will make it rather difficult for me to prune some of those branches growing at odd angles, because I won't be able to see what I'm doing in that thick foliage.
Just wondering if any experts in here can clear this up for me. Thanks.