
Orange-Black Blisters on Hollyhocks
The stems, leaf stalks, and the bottoms of the leaves of the hollyhocks in my garden are filled with orange-black blisters. The leaves eventually dry up and fall off. The blooms are not affected.
Your hollyhocks, like most, are suffering from rust. This is a common fungal disease on hollyhocks. Sanitation and proper planting may help reduce the problem. Remove and destroy all infected plant material in the fall. Make sure your hollyhocks are growing in full sun with plenty of room and good air circulation. I often plant other flowers in front of my hollyhocks to mask the damaged leaves. For totally disease free plants you can use a fungicide labeled to control rust on flowers. And as always read and follow label directions.
Related
Upcoming Live Events
& Webinars
Feb. 12, 2025
FREE WEBINAR:
Organic Insect Pest Management for Vegetable and Flower Gardens
Register here
Feb. 14-16, 2025
NARI Milwaukee Spring Home Improvement Show
West Allis, WI
Feb. 19, 2025
FREE WEBINAR:
Strategies for Managing Invasive Plants
Register here
Feb. 26, 2025
FREE WEBINAR:
Create a Beautiful Shade Garden
Register here
Feb. 27, 2025
FREE WEBINAR:
How to Select Rain Garden Plants
Register here
March 12, 2025
FREE WEBINAR:
Grow Pollinator-friendly Spring and Summer Flowering Bulbs
Register here
March 19, 2025
FREE WEBINAR:
Be a Waterwise Gardener
Register here
March 22, 23, 29, 30, 2025
REALTORS Home & Garden Show
West Allis, WI
March 26, 2025
FREE WEBINAR:
Succession Planting & Crop Rotation
Register here
March 27, 2025
FREE WEBINAR:
Rain Garden Q & A
Register here
April 2, 2025
FREE WEBINAR:
Container Gardens for Sun & Shade
Register here
April 10, 2025
FREE WEBINAR:
Reinvigorate Your Rain Garden
Register here
May 7, 2025
FREE WEBINAR:
Vertical Gardening
Register here
May 15, 2025
FREE WEBINAR:
7 Steps to Managing Water on Your Property
Register here
June 4, 2025
FREE WEBINAR:
Attracting Hummingbirds
Register here
WATCH ON-DEMAND WEBINARS
Learn More