Leaking Tree Sap
In pruning some branches off a large walnut tree, sap is leaking out like a dripping tap. Do I need to worry about this? If so, what do I do?
Certified GKH Gardening Expert
Sap flow does not hurt the tree. Some trees have free-flowing sap that “bleeds” after late winter or early spring pruning. Pruning in early to midsummer, after the leaves have matured, will prevent unsightly sap flow.