Sudden Hemlock Decline: Drought Damage or Hidden Injury?

A 50-year-old hemlock in western Massachusetts lost its top half in three weeks—completely brown while the lower half remained green. No visible pests or disease signs. The owner wondered if summer drought was the cause and whether to remove the dead top or the whole tree.

Expert Assessment

Jen suspects drought or a high-up injury (lightning, mechanical) cut off water to the crown. Since no foliar symptoms or insects are present, an environmental factor is likely.

Recommended Steps

1. Hire an arborist to remove the dead top safely.
2. Ask the arborist to inspect for borers, cankers, or other hidden issues.
3. If the lower tree is healthy, retain it and provide supplemental water during dry spells.
4. Monitor for further decline.

Removing the dead portion reduces hazard and may allow the tree to compartmentalize the damage.