I have several wild cherry trees on my property.I just picked enough to make a small batch of jelly, but I could have picked three times as much if I was 20 ft. tall. I have some younger trees that aren't so tall yet and I wondering if I can cut off the tops and keep them pruned so they don't get so big? If so, when is the best time of year to prune them? I'm also thinking of starting some seed from them to transplant later. Any advice will be appreciated.