Reviving a Potted Rose in Hawaii: Insects, Mildew, and Transplanting Advice

Diagnosing Multiple Problems

A rose in a large pot in Hawaii showing leaf drop, holes, yellowing, and now a white film on stems faces several issues: past aphid/ant infestation, likely powdery mildew (white film), and possible root stress from daily watering.

Immediate Care

• Powdery mildew: Spray 1 tbsp Lysol or Mr. Clean per gallon of water weekly until daytime highs reach 80°F and nights 60°F—then it usually fades naturally.
• Insects: Use insecticidal soap as directed. Spray only when pests are visible to preserve beneficials.
• Watering: Daily watering in a pot risks root rot. Ensure drainage holes work; water only when top inch is dry.
• Pot size: 1 ft diameter × 2 ft deep is adequate for now. Repot only if roots circle the bottom.

Transplanting to Ground

1. Wait until the rose recovers fully (healthy foliage, no pests).
2. Dig hole 1/3 larger than pot. Add 2–3 inches soil, then 1 cup bone meal.
3. Slide root ball out intact, place in hole, backfill, water deeply.
4. Mulch well. Avoid nitrogen fertilizer until established.

Bonus Tip

Try foliar feeding with Monty's Joy Juice 2-15-15 (low nitrogen) to thicken cell walls and boost disease resistance.