Pruning Trees and Shrubs. Rick Abrahamson University of Minnesota Extension Clay County. When should trees and shrubs be pruned?. January - February. Oak Oak Wilt Elm Dutch Elm Disease. March. Oak Ash Ash borer Birch Bronze Birch borer. Fireblight control Apple/crabapple
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University of Minnesota Extension
Shade and ornamental trees
PoplarEarly April (1st – 15th)