Pruning is best done in the dormant season from January through March. Sap may run from the wounds, but this will not harm the tree. Some pruning may also be done in late June or early July to remove multiple stems. This is particularly desirable after late spring frost damage.

Can you trim walnut trees in the summer?

Monitor the walnut tree closely to ensure that the cuts are healing well before the tree goes into winter dormancy. Small shoots may regrow around the cuts when a tree is pruned in the summer. Prune again at the end of the winter when the tree is dormant to ensure clean growth the following spring.

How do you prune a mature walnut tree?

Cut off low-hanging, weak, or damaged branches, and get rid of any branches that rub against each other. Then, continue pruning your trees every 3-5 years as they mature. With regular maintenance, you can keep your trees healthy, get rid of competing branches, and maximize their growth potential.