Why Double Knock Out Rose Buds Won't Open: Weather vs. Nutrition

Mary's second-year Double Knock Outs had healthy foliage and plenty of buds that wouldn't open after aphid treatment. Jay's analysis:

Likely Causes

• Cool/cloudy weather: Slows bud development; even in SC, a cool snap caused browning/non-opening.
• Under-fertilization: "Have you fertilized them yet?"

Checklist

1. Buds not browning? → Likely weather delay.
2. Foliage healthy? → Roots okay.
3. Apply balanced rose fertilizer if not done.
4. Wait for warm, sunny days—buds should open.

Knock Outs are generally reliable re-bloomers; this is likely a temporary weather stall.