Troubleshooting
Arroyo Lupine problems — and how to fix them
Arroyo Lupine (Lupinus succulentus) 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.
Root and crown rot
Wet or waterlogged soil, especially over summer, causes rapid collapse. Ensure excellent drainage and do not irrigate established plants heavily. Crown-area mulch piling worsens this problem.
Powdery mildew
Common in dense stands or humid, shaded sites. Thin plantings for airflow; sow in full-sun positions. Generally cosmetic and does not stop self-seeding.
Aphid colonies
Lupine aphids target soft new growth in spring. Dislodge with a strong water jet or introduce lacewings and ladybugs. Avoid pesticides during peak pollinator activity.
Prevent arroyo lupine problems before they start
Most arroyo lupine issues are care-mismatch, not bad luck. Dial in the basics:
Looking for arroyo lupine in general rather than its problems? Read the full arroyo lupine care guide — light, water, soil and feeding.
Arroyo Lupine problems — FAQ
Why is my arroyo lupine root and crown rot?
Wet or waterlogged soil, especially over summer, causes rapid collapse. Ensure excellent drainage and do not irrigate established plants heavily. Crown-area mulch piling worsens this problem.
Why is my arroyo lupine powdery mildew?
Common in dense stands or humid, shaded sites. Thin plantings for airflow; sow in full-sun positions. Generally cosmetic and does not stop self-seeding.
Why is my arroyo lupine aphid colonies?
Lupine aphids target soft new growth in spring. Dislodge with a strong water jet or introduce lacewings and ladybugs. Avoid pesticides during peak pollinator activity.