Leonidas Rose Recovery After Dormant Spray Damage

Your Leonidas rose dropped all new growth after a dormant oil/sulfur spray. The sulfur burned tender foliage but didn't kill the plant. Recovery is straightforward.

What Happened

Dormant sprays (lime-sulfur, copper, horticultural oil) are for truly dormant wood. Applied to swelling buds or new growth, sulfur causes phytotoxicity—leaf burn and drop. The canes and roots survive.

Recovery Steps

1. Prune off all damaged, sad-looking foliage cleanly
2. This stimulates fresh basal breaks
3. Water normally, no fertilizer until new growth hardens

Future Aphid Control (Safer)

• Blast with strong water jet—aphids can't climb back up
• Birds eat fallen aphids eagerly
• Insecticidal soap if water fails
• Avoid dormant sprays on leafed-out plants

Outlook

Leonidas is a vigorous rose. It will regrow clean foliage and bloom normally this season. The spray damage is a setback, not a death sentence.