Roses Opening Too Fast ("Blowing"): Causes and Climber Management

A gardener with climbing roses noticed blooms opening wide overnight ("blowing"), wanting to slow the process. Plants also showed bare lower canes.

Three Causes of Fast Opening

1. Excess nitrogen – Promotes rapid petal expansion over substance.
2. Cool-to-hot temperature swing – Buds form in cool, open in sudden warmth.
3. Genetic trait – Some climbers naturally "blow" quickly.

Diagnosis: Watch Fall Blooms

If fall flowers (cooler temps) hold better → weather cause. If same behavior → genetic.

Climber Bare-Leg Solutions

Climbers naturally concentrate growth upward. Options:

• Underplant: Perennials (catmint, salvia, lavender) or low shrubs at base.
• Layer canes: Train some canes horizontally low on trellis—stimulates lateral flowering shoots.
• Hard prune at planting: Only works on NEW plants—cut to 12 inches forces basal breaks.

For Established Climbers

Don't hard prune now—too late. Focus on underplanting and horizontal training of new canes. Accept that some varieties bloom briefly but magnificently!