Dogwood Tree Not Blooming? Lawn Chemicals May Be the Culprit

A Long Island gardener watched her beloved dogwood fail to flower after two years of heavy lawn fertilization and repeated weed‑killer applications. The tree leafed out but produced zero blooms while neighboring dogwoods flourished.

Why Excess Nitrogen Stops Flowers

Turf fertilizers are high in nitrogen, which pushes vegetative growth at the expense of flower buds. Dogwoods set their flower buds the previous season; a surplus of nitrogen in late summer/fall can suppress bud formation. The herbicides themselves (broadleaf weed killers) can also stress the tree, but the primary issue is the fertilizer regimen.

Practical Solution: Create a Mulch Buffer

Since the landlord insists on a perfect lawn, the expert suggests removing turf in a wide circle around the dogwood’s root zone and replacing it with 2–4 inches of organic mulch. This isolates the tree from broadcast fertilizer, conserves moisture, and protects the trunk from mower damage. Long‑term, the landlord may accept a defined mulch bed as a neat landscape feature.

What to Expect

This year’s flower buds are already set (or not), so no immediate bloom recovery is possible. But with the buffer in place, next season’s buds should form normally. The tree is unlikely to die from the chemical exposure alone.