Troubleshooting
Fernleaf Lavender problems — and how to fix them
Fernleaf Lavender (Lavandula multifida) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Stem rot in cool, wet conditions
Cold, wet winters kill stems at the base; in borderline climates, pot up before autumn frosts and keep in a frost-free, well-ventilated greenhouse at a minimum of 3–5°C.
Aphid infestations
Colonies of lavender aphid (Myzus persicae and related species) gather on young shoot tips and flower spikes, causing distortion; treat with a strong water jet or insecticidal soap, taking care to avoid flowers visited by pollinators.
Prevent fernleaf lavender problems before they start
Most fernleaf lavender issues are care-mismatch, not bad luck. Dial in the basics:
Fernleaf Lavender problems — FAQ
Why is my fernleaf lavender stem rot in cool, wet conditions?
Cold, wet winters kill stems at the base; in borderline climates, pot up before autumn frosts and keep in a frost-free, well-ventilated greenhouse at a minimum of 3–5°C.
Why is my fernleaf lavender aphid infestations?
Colonies of lavender aphid (Myzus persicae and related species) gather on young shoot tips and flower spikes, causing distortion; treat with a strong water jet or insecticidal soap, taking care to avoid flowers visited by pollinators.