Troubleshooting
Russell Lupin 'Band of Nobles' problems — and how to fix them
Russell Lupin 'Band of Nobles' (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.
Lupin aphid
Large grey-white aphids are the most serious pest; treat early and thoroughly with insecticidal soap, as infestations spread rapidly and weaken plants significantly.
Powdery mildew
Common in hot, dry summers; improves with removal of affected foliage and better spacing.
Short-lived vigour
Seed-raised Russell types often decline after 3-4 years; sow fresh seed annually or biannually to maintain a display.
Crown rot
Wet soils in winter or summer cause root and crown rot; ensure free-draining conditions.
Colour run in self-seeded plants
Self-sown seedlings revert to weaker, less vibrant colours; deadhead promptly to maintain named-strain characteristics.
Prevent russell lupin 'band of nobles' problems before they start
Most russell lupin 'band of nobles' issues are care-mismatch, not bad luck. Dial in the basics:
Russell Lupin 'Band of Nobles' problems — FAQ
Why is my russell lupin 'band of nobles' lupin aphid?
Large grey-white aphids are the most serious pest; treat early and thoroughly with insecticidal soap, as infestations spread rapidly and weaken plants significantly.
Why is my russell lupin 'band of nobles' powdery mildew?
Common in hot, dry summers; improves with removal of affected foliage and better spacing.
Why is my russell lupin 'band of nobles' short-lived vigour?
Seed-raised Russell types often decline after 3-4 years; sow fresh seed annually or biannually to maintain a display.
Why is my russell lupin 'band of nobles' crown rot?
Wet soils in winter or summer cause root and crown rot; ensure free-draining conditions.
Why is my russell lupin 'band of nobles' colour run in self-seeded plants?
Self-sown seedlings revert to weaker, less vibrant colours; deadhead promptly to maintain named-strain characteristics.