Slender deutzia (Deutzia gracilis): when and how to prune

Slender deutzia (Deutzia gracilis): when to prune it?

JFMAMJJASOND

Straight after flowering, from late June to early July. It flowers on the previous year’s wood.

What else to prune in those months? June · July

Slender deutzia (Deutzia gracilis): how to prune it?

1. Cut flowered stems back to just above a strong, young side shoot.
2. Every other year, remove a few of the oldest stems at the base so that young ones can take their place.
3. Remove dead, weak and inward-growing twigs.
4. Renovate a neglected shrub over three years by taking out a third of the old stems each year.

How much to cut, and how often?

• One pruning period a year: June–July.
• Prune in moderation: never remove more than about a third of the shrub at once.

What does it mean for wildlife?

• Pruning in June–July can fall in the nesting season (15 March–15 August). Check carefully for nesting birds first: disturbing an active nest is against the law.
• Slender deutzia (Deutzia gracilis) flowers in May–June, when it attracts bees.
• If pruning falls during flowering, wait until it is over or leave part of the plant to flower, so bees and butterflies still benefit.
• Prunings can go on a dead hedge or brash pile in a corner of the garden: shelter for hedgehogs, wrens and insects.

Common mistakes

• Clipping without first checking for nesting birds.
• Leaving a stub or sawing flush with the trunk: cut just outside the branch collar.

Nearby: related pruning guides

• Deutzia
• Fuzzy deutzia (Deutzia scabra)
• Barberry
• Blackthorn
• Box (buxus)
• Californian lilac

Plant profile: Slender deutzia (Deutzia gracilis) · Pruning calendar and basic rules