Troubleshooting
Daylily 'Primal Scream' problems — and how to fix them
Daylily 'Primal Scream' (Hemerocallis 'Primal Scream') 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.
Daylily rust in humid summers
Spray with a triazole fungicide at first sign of orange pustules. Remove and bag affected foliage.
Thrips causing petal streaking
Spinosad applied at bud-break controls thrips effectively; repeat every 7-10 days during bloom.
Aphids on new scapes
Hose off with a strong jet or apply insecticidal soap. Check for ants farming aphids and control with sticky bands.
Sunscald in extreme heat
Above 38°C, outer petals may bleach or burn. Temporary shade cloth during heat waves protects blooms.
Clump decline
Divide every 4-5 years in late summer or early spring. Prolific bloomers benefit from division more than lighter-flowering varieties.
Prevent daylily 'primal scream' problems before they start
Most daylily 'primal scream' issues are care-mismatch, not bad luck. Dial in the basics:
Daylily 'Primal Scream' problems — FAQ
Why is my daylily 'primal scream' daylily rust in humid summers?
Spray with a triazole fungicide at first sign of orange pustules. Remove and bag affected foliage.
Why is my daylily 'primal scream' thrips causing petal streaking?
Spinosad applied at bud-break controls thrips effectively; repeat every 7-10 days during bloom.
Why is my daylily 'primal scream' aphids on new scapes?
Hose off with a strong jet or apply insecticidal soap. Check for ants farming aphids and control with sticky bands.
Why is my daylily 'primal scream' sunscald in extreme heat?
Above 38°C, outer petals may bleach or burn. Temporary shade cloth during heat waves protects blooms.
Why is my daylily 'primal scream' clump decline?
Divide every 4-5 years in late summer or early spring. Prolific bloomers benefit from division more than lighter-flowering varieties.