Question
I planted a Willow last fall and trimmed a larger branch near the base of the
trunk.  The trunk below that spot has been wet ever since.  Do I need to seal the
cut somehow?

Thanks!

Answer
Willows tend to bleed when pruned. It is not necessary to put anything on this wound it will heal over time by itself. The "bleeding" is not hurting anything. Willows use more water than other trees thus they seem to bleed more than most tree. This tree is young and growing so it will heal over the wound as it grows.