How to Care for Box Hedges

Box (Buxus) is a classic hedging plant, perfect for formal gardens and topiary. With proper care, it provides year-round structure, though it does face some challenges from pests and diseases.

When to clip

• Main clip: Late May to early June, after the first flush of growth.
• Second clip: Late August to September if needed to tidy up.
• Avoid clipping in late autumn or winter – new growth may be damaged by frost.
• Clip on a cloudy day to prevent leaf scorch.

How to clip

• Use sharp shears or a hedge trimmer.
• For topiary, hand shears give more control.
• Clip to shape, removing about half the new growth.
• Make the hedge slightly narrower at the top so light reaches the base.
• Clear clippings from inside the hedge to improve air circulation.

Feeding and watering

• Feed in spring with a balanced fertiliser or specialist box feed.
• Mulch with compost to retain moisture and feed the roots.
• Water during dry spells, especially newly planted box.
• Avoid high-nitrogen feeds which produce soft growth prone to disease.

Box blight

Box blight is a fungal disease causing brown patches and leaf drop. To manage it:

• Improve air circulation by thinning dense growth.
• Avoid overhead watering and clipping when wet.
• Remove and destroy affected material (do not compost).
• Disinfect tools between plants.
• Consider fungicide treatments as a preventative.
• In severe cases, replace with blight-resistant alternatives.

Box tree caterpillar

This pest can strip box plants bare. Signs include webbing and green-black caterpillars.

• Check plants regularly from spring onwards.
• Pick off caterpillars by hand if numbers are small.
• Use pheromone traps to monitor moth activity.
• Spray with an appropriate insecticide or biological control (Bacillus thuringiensis).
• Healthy plants usually recover from attacks.

Alternatives to box

If box problems are severe, consider alternatives:

• Ilex crenata: Japanese holly, very similar appearance.
• Lonicera nitida: Fast-growing, needs more frequent clipping.
• Euonymus japonicus: Glossy leaves, good for formal hedging.
• Taxus baccata: Yew, excellent for larger hedges.