Controlling Hollyhock Rust: Watering Practices, Sanitation, and Fungicide Options

Managing Rust on Hollyhocks

Hollyhock rust (Puccinia malvacearum) appears as orange-brown pustules on leaf undersides. It spreads via water splash and thrives in humid conditions.

Cultural Controls

• Water at soil level only—never overhead.
• Remove infected leaves as soon as they appear; dispose in trash, not compost.
• Thin plants for air circulation.
• Clean up all debris in fall.

Fungicide

If rust is severe, apply a neem-oil-based fungicide (e.g., Schultz Fungicide 3 with Neem Oil) according to label. Begin at first sign and repeat every 7–14 days.

Seed Head Management

Cut seed heads with scissors (don't pull) to avoid spreading spores. Leave stalks until seeds mature if you want volunteers.

Consistent sanitation and targeted spraying keep rust manageable.