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Hollyhocks are beautiful, tall flowering plants that add charm to any garden. However, they are susceptible to a common fungal disease called rust, which can damage their appearance and health. Recognizing and treating rust early is key to maintaining healthy hollyhocks.
How to Spot Rust on Hollyhocks
Rust appears as orange or rust-colored spots on the leaves and stems of hollyhocks. It often starts on the underside of the leaves, making it easy to overlook. Over time, the spots may enlarge and coalesce, causing the leaves to yellow, wilt, and drop prematurely. In severe cases, the plant’s growth can be stunted, and flowering may be reduced.
Signs to Look For
- Orange or rust-colored pustules on leaves and stems
- Yellowing and wilting of affected leaves
- Premature leaf drop
- Reduced flowering or distorted blooms
How to Treat Rust on Hollyhocks
Early intervention is essential to control rust. Here are effective methods to treat and prevent the disease:
Remove Affected Foliage
Carefully prune and remove all infected leaves and stems. Dispose of these materials away from your garden to prevent spores from spreading.
Improve Air Circulation
Ensure proper spacing between plants and prune overcrowded areas. Good airflow reduces humidity, making it less favorable for fungal growth.
Apply Fungicide
Use a fungicide labeled for rust control on hollyhocks. Follow the manufacturer’s instructions carefully. Reapply as recommended, especially after rain.
Practice Garden Hygiene
Regularly clean up fallen leaves and debris around your hollyhocks. This reduces the chance of spores overwintering and causing future infections.
Preventing Rust in the Future
Prevention is the best approach to keep rust at bay. Here are some tips:
- Plant resistant hollyhock varieties if available.
- Ensure proper spacing and good air circulation.
- Water at the base of plants to avoid wet foliage.
- Apply preventive fungicides in early spring.
- Rotate hollyhocks with other plant families each year to reduce disease buildup.
By monitoring your hollyhocks regularly and taking prompt action, you can keep rust under control and enjoy healthy, vibrant plants all season long.