Recently I purchased 10 acres of old farmsite here in MN. There are two very large old pear trees (the big one is 40 feet tall). Neither of these have been pruned for at least 10 years. I'm assuming it's a good idea to clean these up. Suggestions? My thoughts is cut off all dead branches and any angling down. Also, there are a few smaller shoots coming from the stump area. Do I keep those? thank you