Troubleshooting
Cape daisy problems — and how to fix them
Cape daisy (Osteospermum ecklonis) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Summer dormancy and flower cessation
Cape daisies naturally reduce or stop flowering in high summer temperatures above 28–30°C. This is not a sign of disease. Cut plants back by one-third, reduce feeding, and maintain moderate watering; flowering returns vigorously when temperatures cool in early autumn.
Downy mildew
Yellowing on upper leaf surfaces with grey-purple sporulation beneath is caused by Peronospora species, promoted by cool, wet, humid conditions. Remove affected leaves promptly, improve air circulation, water only at the base, and apply copper-based fungicide preventively in high-risk seasons.
Aphids
Soft shoot tips are colonised by green aphids in spring and early summer, causing distorted leaves and flower buds. Apply a strong jet of water to dislodge colonies, then spray with insecticidal soap or neem oil. Repeat every 5–7 days until populations collapse.
Prevent cape daisy problems before they start
Most cape daisy issues are care-mismatch, not bad luck. Dial in the basics:
Looking for cape daisy in general rather than its problems? Read the full cape daisy care guide — light, water, soil and feeding.
Cape daisy problems — FAQ
Why is my cape daisy summer dormancy and flower cessation?
Cape daisies naturally reduce or stop flowering in high summer temperatures above 28–30°C. This is not a sign of disease. Cut plants back by one-third, reduce feeding, and maintain moderate watering; flowering returns vigorously when temperatures cool in early autumn.
Why is my cape daisy downy mildew?
Yellowing on upper leaf surfaces with grey-purple sporulation beneath is caused by Peronospora species, promoted by cool, wet, humid conditions. Remove affected leaves promptly, improve air circulation, water only at the base, and apply copper-based fungicide preventively in high-risk seasons.
Why is my cape daisy aphids?
Soft shoot tips are colonised by green aphids in spring and early summer, causing distorted leaves and flower buds. Apply a strong jet of water to dislodge colonies, then spray with insecticidal soap or neem oil. Repeat every 5–7 days until populations collapse.