Pruning Hemlock Trees for Hedge Shape and Size

Homeowner has a row of 12 hemlocks (2+ years old) along a driveway; they’re getting too tall. Asks when and how to prune.

Best Pruning Times

• Late winter (before spring growth) – ideal for shaping and size control.
• Late spring/early summer – second flush if growth is vigorous.
• Avoid fall and mid-summer – cuts won’t heal before winter or may force tender growth that freezes.
• Emergency pruning (dead/broken limbs) anytime.

Pruning Guidelines

• Use sharp tools; cut just outside the branch collar.
• For hedges, shear after first/second year once established.
• Maintain at least 2/3 of height in foliage when limbing up.
• Sanitize tools if removing diseased wood.