Now is a good time to prune deciduous trees and pruning sealer will not help and will not stop slime flux.

by Curtis Smith, PhD, NMSU Extension Horticulture Specialist
Southwest Yard and Garden column

Q. When is the best time to remove cottonwood tree branches? Is there something to coat the “wound” to stop sap flow? Last spring I cut off a low hanging branch [3 inches in diameter] and it “bled” all summer killing the grass beneath. I have two more branches needing removal; is now a good time before the sap starts to flow? Any “dos” or “don’ts”? Thanks for any advice you can provide.

Paul D.
Albuquerque

A. The best time for major pruning of deciduous trees is now, the late dormant season. When necessary for safety or to remove dead branches, any time is the right time. However, when you are cutting large branches, do it during the dormant season. That time will end soon. (continued at SW Yard and Garden column February 20, 2010)