Troubleshooting
Lupine problems — and how to fix them
Lupine (Lupinus polyphyllus) 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.
Aphids in spires
Lupin aphid is a major pest; rinse off or apply soap.
Powdery mildew
Late season; cut back hard after flowering.
Short-lived
Replace every 3-5 years from seed.
Slug damage on young shoots
Ring with grit in spring.
No flowers in shade
Lupines need sun for spires.
Prevent lupine problems before they start
Most lupine issues are care-mismatch, not bad luck. Dial in the basics:
Lupine problems — FAQ
Why is my lupine aphids in spires?
Lupin aphid is a major pest; rinse off or apply soap.
Why is my lupine powdery mildew?
Late season; cut back hard after flowering.
Why is my lupine short-lived?
Replace every 3-5 years from seed.
Why is my lupine slug damage on young shoots?
Ring with grit in spring.
Why is my lupine no flowers in shade?
Lupines need sun for spires.