Troubleshooting
Cosson's Germander problems — and how to fix them
Cosson's Germander (Teucrium cossonii) 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.
Root rot in winter wet
The primary cause of losses in UK and PNW gardens; even short periods of waterlogging during cold weather rot the fine roots and crown. Grow in raised scree beds or against a dry, south-facing wall.
Stem dieback from frost combined with moisture
Frost alone is usually tolerated, but frost on wet stems causes dieback; protect with a grit mulch around the crown and ensure overhead shelter in particularly cold, wet winters.
Prevent cosson's germander problems before they start
Most cosson's germander issues are care-mismatch, not bad luck. Dial in the basics:
Cosson's Germander problems — FAQ
Why is my cosson's germander root rot in winter wet?
The primary cause of losses in UK and PNW gardens; even short periods of waterlogging during cold weather rot the fine roots and crown. Grow in raised scree beds or against a dry, south-facing wall.
Why is my cosson's germander stem dieback from frost combined with moisture?
Frost alone is usually tolerated, but frost on wet stems causes dieback; protect with a grit mulch around the crown and ensure overhead shelter in particularly cold, wet winters.