QuestionsHow to growTrees and ShrubsPruningPruning silver birch 0 Vote Up Vote Down Monique Bolger asked 15 years ago We cut off a few branches of a silver birch which was getting too bushy and preventing light entering our dining room and the bedroom upstairs. Should the cuts (up to 8 cm diameter) be sealed with something? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 7 years ago No pruning sealer is necessary.