I had a bunch of these n a couple Procumbens I just got recently, I assumed since it was a reproductive thing- much like a flower say on an azalea- they were probably sapping some energy that could begin into healthy growth, so I removed them... Plus they were a little bit unsightly IMO, so the trees look a little better without them... Some of the growth around where the pollen cones are was getting a little yellow which I took as a sign that my assumption about them sapping energy might be right... Or the trees are just pot bound. I repotted one and it was rather pot bound, so it might be a combination of factors..