Common Hedge Problems: Brown Patches, Gaps & Dieback

By Paul Watmore, Director at Grasslands Nursery

Most hedge problems — brown patches, gaps, a thinning base, yellowing or dieback — come down to watering, drainage, light, pruning mistakes or a specific pest, and the right fix depends on the plant. This guide helps you diagnose the common issues and points you to the species-specific solution.

Brown patches

On conifers like Leylandii, brown patches are often over-cutting into old wood (permanent), conifer aphid, or drought. On laurel, browning is usually drought, frost or trimmer damage. Identify the plant, then see our species guides for the fix.

Gaps and a thin, bare base

Gaps are often caused by too little light at the bottom (keep a batter — wider at the base), uneven establishment, or animal damage (rabbits, deer). Trimming the top and sides encourages denser low growth; for stubborn gaps, replant with a matching plant and keep it well watered to catch up.

Yellowing leaves

Yellowing usually means waterlogged or compacted soil (most common), or a nutrient shortage. Check drainage first, then feed in spring and mulch.

Dieback

Whole-stem dieback points to drought, waterlogging or root problems — and occasionally honey fungus. Improve drainage and watering, cut back to healthy growth, and feed and mulch.

Pests and disease

Common culprits include conifer aphid (Leylandii), box blight and box tree caterpillar (box), and leaf spot (Photinia). Each has a specific fix in our species guides.

How to revive a struggling hedge

Whatever the plant: check drainage and watering first (they cause most problems), feed in spring, mulch, trim out clearly dead growth, and be patient. For plant-specific help see our guides on laurel, Leylandii, box and Photinia. Browse our full hedging range for replacements.

FAQs

Why does my hedge have brown patches?
It depends on the plant: on conifers, over-cutting, aphids or drought; on laurel, drought, frost or trimmer damage. Identify the plant and check watering and drainage first.

Why are there gaps in my hedge?
Usually too little light at the base, uneven establishment, or animal damage. Keep a batter (wider at the base), trim to thicken growth, and replant stubborn gaps.

Why is the base of my hedge bare?
Most often shading at the bottom. Keep the hedge wider at the base than the top so light reaches the lower growth, and trim to encourage density.

Will a bare or patchy hedge fill back in?
If green growth remains and the cause is fixed, most broadleaf hedges refurnish; conifers like Leylandii will not regrow from bare wood, so gaps there usually need replanting.

About the author: Paul Watmore is a director at Grasslands Nursery, a family-run plant nursery near Knutsford, Cheshire, growing hedging, pleached trees and specimen plants since 1984. Meet the team →