Troubleshooting
Daylily 'Stella de Oro' problems — and how to fix them
Daylily 'Stella de Oro' (Hemerocallis 'Stella de Oro') 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.
Hemerocallis rust
Puccinia hemerocallidis causes orange pustules on leaves. Remove affected foliage and apply a registered fungicide; improve air circulation.
Aphids on scapes
Cluster at flower buds; knock off with a strong water jet or apply insecticidal soap. Natural predators usually keep populations in check.
Thrips causing streak marks
Silver streaking on petals indicates thrips. Use spinosad spray during bud stage. Remove debris around clumps where thrips overwinter.
Clump congestion
After 3-4 years, clumps become crowded and bloom declines. Divide in late summer or early autumn, replanting enriched sections.
Crown rot
Caused by poor drainage or excess moisture. Plant on a slightly raised position, improve drainage, and avoid mulching directly over the crown.
Prevent daylily 'stella de oro' problems before they start
Most daylily 'stella de oro' issues are care-mismatch, not bad luck. Dial in the basics:
Daylily 'Stella de Oro' problems — FAQ
Why is my daylily 'stella de oro' hemerocallis rust?
Puccinia hemerocallidis causes orange pustules on leaves. Remove affected foliage and apply a registered fungicide; improve air circulation.
Why is my daylily 'stella de oro' aphids on scapes?
Cluster at flower buds; knock off with a strong water jet or apply insecticidal soap. Natural predators usually keep populations in check.
Why is my daylily 'stella de oro' thrips causing streak marks?
Silver streaking on petals indicates thrips. Use spinosad spray during bud stage. Remove debris around clumps where thrips overwinter.
Why is my daylily 'stella de oro' clump congestion?
After 3-4 years, clumps become crowded and bloom declines. Divide in late summer or early autumn, replanting enriched sections.
Why is my daylily 'stella de oro' crown rot?
Caused by poor drainage or excess moisture. Plant on a slightly raised position, improve drainage, and avoid mulching directly over the crown.