We have 2 different types of ash trees planted near each other. Is it OK to...
We have 2 different types of ash trees planted near each other. Is it OK to trim low branches off in early May? Due to the shallow root system, grass has died out around the trees. I read we shouldn't add dirt to get grass to grow due to the shallow roots. Would it be OK to put mulch around tree base and if so, what type is best?
Stearns County Minnesota
Thank you for the question. It is ok to prune dead branches or those that pose a danger to people or structures at any time, but according to the University of Minnesota Extension publication "Pruning Trees and Shrubs" the late dormant season is best for most pruning. Pruning in late winter, just before spring growth starts, leaves fresh wounds exposed for only a short length of time before new growth begins the wound sealing process. Another advantage of dormant pruning is that it's easier to make pruning decisions without leaves obscuring plant branch structure. Pruning at the proper time can avoid certain disease and physiological problems.