Pruning Summer-Flowering Hedges and Shrubs in August
August is the ideal month to prune many summer-flowering hedges and shrubs once their blooms have faded. Pruning now encourages fresh growth, shapes your garden for autumn, and sets you up for an even better flower show next year. Here’s how to get it right for healthy, beautiful results.
Why Prune in August?
- Plant Health: Removing spent blooms and thinning out old stems triggers strong, bushy regrowth.
- Better Blooms Next Year: Many shrubs flower on new stems produced after August pruning.
- Tidy Borders: Neaten up straggly or overgrown hedges at the end of the main growing season.
- Reduce Disease and Pests: Clean cuts and removing dead or diseased wood decreases fungal problems as days shorten.
Which Shrubs and Hedges to Prune after Summer Flowering?
- Weigela
- Deutzia
- Philadelphus (mock orange)
- Flowering currant (Ribes)
- Escallonia
- Forsythia (if missed earlier)
- Hydrangea arborescens and paniculata types
- Summer-flowering Viburnum and Spiraea
- Privet, lonicera, or mixed ornamental hedges
Note: Don’t prune spring-flowering shrubs—they set buds in autumn for next year’s blooms!
How to Prune Effectively in August
- Remove Spent Flowers and Stems:
Cut back fading flowerheads and the flowering stem to a strong pair of leaves or side shoot. - Thin Old, Woody Growth:
Take out up to a third of the oldest stems at ground level for shrubs, encouraging young, vigorous replacement shoots. - Shape the Hedge or Shrub:
Trim back straggly growth and tidy overall shape with sharp secateurs or hedge shears. - Remove Dead or Diseased Wood:
Always cut out brown, withered, or affected stems. Burn or bin diseased clippings. - Clear Debris:
Gather and compost healthy trimmings. Clean up the base for better airflow and to reduce future pest problems.
Pro Tips
- Prune on a dry day for faster healing and less disease risk.
- Mulch and feed around the base after pruning to encourage strong new growth and root development.
- Water well after heavy pruning, especially during dry and hot spells.
By pruning your summer-flowering hedges and shrubs in August, you create tidy, healthy, beautifully-shaped plants ready to dazzle again next year—and prevent the build-up of pests and diseases over winter.
⭐ Recommended Products — Garden & Allotment Essentials for March
March is when the growing season truly begins. Seeds are being sown daily, beds are prepared and late frosts are still possible — these essentials help produce strong plants and a successful start.
Seed Trays, Modules & Propagation Kits — perfect for tomatoes, brassicas, lettuce, onions and flowers. 👉
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Heated Propagators, Heat Mats & Grow Lights — improves germination and prevents leggy seedlings during cold nights. 👉
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Seed & Cutting Compost — essential for healthy seedlings and strong root growth. 👉
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Garden Fleece & Plant Protection Covers — protects seedlings, potatoes and early plantings from late frost. 👉
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Spring Vegetable Seeds — carrots, beetroot, peas, spinach and salads can all be started now. 👉
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Garden Kneeler & Seat — makes long sowing and planting sessions far more comfortable. 👉
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Pressure Washer (Greenhouse & Patio Cleaning) — clean patios, paths and greenhouses before planting. 👉
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Solar Garden Lights — perfect for enjoying the garden during brighter spring evenings. 👉
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