Safe Pruning of Sugar Mapels
Live in St. Marys, zone 7b (zip20619) Have I missed my chance for this season? (Todays temp high 21 but above freezing highs in following days.) Also are Acer as a class all sensitive to pruning (copious loss of sap) in less than dead winter in particular the Japanese Maples?
St. Mary's County Maryland
The best time to prune a sugar maple is the winter when fully dormant. Maples may 'bleed' when the sap begins to flow in the spring. This is not harmful and will cease when the tree leafs out.
Japanese maples - Major pruning should be done during the dormant season and just prior to leaf production in the spring. Corrective pruning and training can be done at any time of the year.