How to properly maintain your hedges during summer

Summer is when hedges put on their most vigorous growth, transforming the garden with lush foliage and structure. To keep hedges tidy, healthy and long-lived during the warmer months, a few simple but timely actions make all the difference. This guide explains how to properly maintain your hedges during summer, covering cutting, watering, feeding, mulching and pest control so your boundaries remain attractive and resilient.

Five essential summer-care practices for hedges

Regular trimming to preserve shape and light

Trimming is the cornerstone of summer hedge care. Because growth accelerates in warm weather, regular cuts stop hedges becoming overgrown and help preserve a neat profile. Use sharp, clean hedge shears or a well-maintained electric trimmer and aim for a slight taper — wider at the base than the top — so sunlight can reach lower foliage and reduce bare patches at ground level. Remove only new soft growth when shaping; avoid cutting back into old, woody stems unless you know the species tolerates hard pruning.

For guidance on trimming frequency and timing for different hedge types, see our detailed post on how often to trim your hedges.

Deep watering for root resilience

Summer heat can stress hedges, especially during dry spells. Deep, infrequent watering encourages root systems to grow downwards, making plants more drought-resilient. Water at the root zone rather than overhead to concentrate moisture where it’s needed and reduce fungal risk. The best times are early morning or late evening when evaporation is lowest, so more water reaches the roots.

Mulching to lock in moisture and suppress weeds

Applying a 5–10cm layer of organic mulch such as bark chips or well-rotted compost around the base of your hedges conserves soil moisture, moderates soil temperature and reduces competing weeds. Keep mulch a few centimetres away from the stems to prevent rot, and renew the layer as it decomposes through the season.

Feeding to support vigorous, healthy growth

Summer is a key period to supply nutrients. Use a balanced fertiliser according to the manufacturer’s instructions, or choose organic alternatives like compost or well-rotted manure for a slow-release feed. Avoid over-fertilising — excess nutrients can lead to weak, sappy growth that attracts pests and may require corrective pruning.

Pest and disease monitoring and control

Warm, humid conditions can encourage pests such as aphids and spider mites and make fungal issues more likely. Inspect hedges regularly for discolouration, sticky deposits, leaf loss or unusual growth. Where problems are identified, start with gentle, environmentally friendly remedies to protect beneficial insects — for example, targeted water sprays, biological controls or approved horticultural oils. Seek professional help for persistent infestations or serious diseases.

Practical summer maintenance checklist

• Trim new growth regularly to maintain shape and encourage denser foliage.
• Water deeply at the roots during dry periods, preferably early morning or late evening.
• Apply organic mulch around the base and top up as needed.
• Feed with a balanced fertiliser or organic compost to sustain growth.
• Inspect weekly for pests, diseases and physical damage; act promptly if you spot issues.
• Clear debris from the base to discourage slugs and other pests and to improve air circulation.

Common mistakes to avoid

• Cutting hedges into a blocky shape that shades out lower branches — aim for a tapered profile.
• Frequent, shallow watering that encourages surface roots rather than deep rooting.
• Applying too much fertiliser, which can produce weak, pest-prone growth.
• Ignoring early signs of disease or pest activity; small problems are easier and cheaper to fix.
• Trimming without checking for nesting birds — if you find active nests, delay work or seek advice on lawful timing.

When to call a professional

Some hedge projects are best left to experienced contractors: large or tall hedges requiring ladders or machinery, hedges with significant disease or pest outbreaks, and any situation where access or safety is a concern. Professionals can also advise on species-specific pruning and long-term management plans that improve density and appearance.

If you’d like expert hedge trimming or seasonal care, get in touch via our contact page or ask about our hedge maintenance services. For more on the benefits of regular shaping, read our article on benefits of regular hedge trimming.

Keeping hedges healthy all summer

Consistent attention during summer — sensible trimming, deep watering, mulching, measured feeding and proactive pest checks — will keep hedges looking their best and reduce the need for heavy corrective work later. Small, regular acts of care help hedges remain an attractive, structural element in your garden for years to come.

If you need help with hedge trimming in Hertfordshire, Harpenden, St Albans or nearby areas, call 07775 743861 or email hertfordshiretrees@outlook.com. We’ll provide a tailored quote and advise the best seasonal approach for your hedges.