Weed-and-Feed Fertilizer Burn on a Willow Tree

Herbicide in Lawn Fertilizer Damages Nearby Willow

A homeowner applied weed-and-feed twice to fix dog urine spots. The willow's leaves dried up and fell, but slight green is returning. They ask if the fertilizer hurt the tree.

Cause

Weed-and-feed contains broadleaf herbicide that damages trees. Dog urine near the trunk can also cause yellowing. Normal fertilizer without herbicide is safe.

Recovery

• If new buds are emerging, the tree will likely recover, though some fullness may be lost.
• Switch to liquid lawn herbicide (spot-spray) instead of granular weed-and-feed.
• Water deeply to help flush any residual herbicide.

Never use weed-and-feed under tree canopies.