Split bark in Oak Leaf Mountain Ash
Our oak leaf mountain ash, approx. 15 yrs old, has developed two cracks in the bark, one on a branch and one on the trunk (pics attached). The one on the branch is seeping sap. Is this natural, or something we need to be concerned about? And if so, is there a remedy we can take to prevent further damage? Thank you. Judy Lewandowski
Ramsey County Minnesota
There is nothing to be done about split bark once it has split. Watering the tree until the ground freezes in the fall seems to reduce bark splitting. A 15 year old Mountain Ash is a middle aged tree and bark problems are not unexpected. They are short lived trees, living about 30 years. Sap running from wounds in the spring is normal and does not harm the tree.