Roses

How to Prune Grandiflora Roses
(USDA Hardiness Zone 6: average winter lows about –10°F / –23°C)
Grandiflora roses combine traits of hybrid tea roses and floribundas—they grow tall with large flowers often in clusters. Pruning keeps the plant strong, open, and able to support tall flowering stems.

1. Remove Dead, Damaged, and Diseased Wood
- - Cut out dead, dry, or blackened canes completely.
- - Remove broken or diseased stems down to healthy green wood.
- - Healthy wood should appear green or white inside.
2. Remove Weak and Crowded Growth
- - Cut out thin or weak stems that cannot support large blooms.
- - Remove branches that cross, rub, or grow inward.
- - Clear some growth from the center for better airflow and sunlight.
3. Select Strong Structural Canes
- - Keep 4–6 strong, thick canes forming the main structure. These should grow outward from the center.
4. Shorten the Remaining Canes
- - Cut the strong canes back to 12–24 inches (30–60 cm).
- - Make each cut ¼ inch (5–7 mm) above an outward-facing bud.
- - Cut at a 45° angle.
- - This encourages strong upright stems and large flowers.
5. Shape the Plant
- - Aim for an open vase shape.
- - The center should remain open for air circulation.
6. Remove Small Inner Twigs
- - Trim away tiny twiggy shoots inside the plant.
- - This directs energy to strong flowering stems.
After pruning the plant should have 4–6 strong canes, a balanced upright structure, and plenty of space for tall flowering shoots.