Troubleshooting
Green Cotton Lavender problems — and how to fix them
Green Cotton Lavender (Santolina rosmarinifolia) 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
The most frequent killer: caused by waterlogged or poorly drained soil, especially in winter. Ensure the planting site has fast drainage and avoid mulching directly against the woody base.
Plant splitting open at the centre
Mature plants tend to splay apart after a few years if not pruned regularly; cut back by one-third in early spring and lightly again after flowering to maintain a dense, compact mound.
Honey fungus susceptibility
May be vulnerable to Armillaria (honey fungus) in gardens where the pathogen is already present; there is no chemical cure — remove and destroy affected plants and avoid replanting susceptible species in the same spot.
Prevent green cotton lavender problems before they start
Most green cotton lavender issues are care-mismatch, not bad luck. Dial in the basics:
Green Cotton Lavender problems — FAQ
Why is my green cotton lavender root and crown rot?
The most frequent killer: caused by waterlogged or poorly drained soil, especially in winter. Ensure the planting site has fast drainage and avoid mulching directly against the woody base.
Why is my green cotton lavender plant splitting open at the centre?
Mature plants tend to splay apart after a few years if not pruned regularly; cut back by one-third in early spring and lightly again after flowering to maintain a dense, compact mound.
Why is my green cotton lavender honey fungus susceptibility?
May be vulnerable to Armillaria (honey fungus) in gardens where the pathogen is already present; there is no chemical cure — remove and destroy affected plants and avoid replanting susceptible species in the same spot.