Why Are My Knock Out Rose Petals Crinkled and Pointed?

Crinkled, “crimped” petals on Knock Out roses in Zone 9 (Houston) are typically a heat response. When temperatures soar above 90°F, roses often produce malformed blooms—petals may be folded, pointed, or smaller. Young plants (under 2 years) can also show imperfect flowers until established.

What to Do

• Ensure consistent deep watering during heat waves.
• Apply 2–3 inches of mulch to keep roots cool.
• Provide afternoon shade if possible.
• Avoid fertilizing in extreme heat.

Knock Outs look their best in spring and fall. Summer blooms may be less perfect but the plant remains healthy. No treatment needed—just wait for cooler weather.