- Written by Robbi Hoy
- Hits: 388
Helpful Tip from the Garden Geeks: Weeping can weaken trees. Some trees, such as birch, maple, and willow, weep-or bleed sap-when cut. Losing a little sap is not usually harmful, but heavy weeping can weaken the tree. Try to prune these trees in winter when they are fully dormant, before their sap starts to rise.