Troubleshooting
Silver Thyme problems — and how to fix them
Silver Thyme (Thymus vulgaris 'Silver Posie') 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 rot from overwatering
The number-one killer. Soggy soil rots the crown and roots; plant in gritty, free-draining soil and water sparingly, letting it dry between drinks.
Woody, bare centre
Old plants go leggy and woody in the middle. Trim lightly after flowering each year and replace plants every few years from cuttings to keep them dense.
Loss of variegation (reversion)
Plain green shoots sometimes appear on variegated thyme. Cut these out promptly or they outcompete and overtake the slower silver-marked growth.
Winter wet damage
More likely to die from cold, wet soil than from cold itself. Ensure sharp drainage and consider a gritty mulch or container that can be sheltered in a wet winter.
Prevent silver thyme problems before they start
Most silver thyme issues are care-mismatch, not bad luck. Dial in the basics:
Looking for silver thyme in general rather than its problems? Read the full silver thyme care guide — light, water, soil and feeding.
Silver Thyme problems — FAQ
Why is my silver thyme root rot from overwatering?
The number-one killer. Soggy soil rots the crown and roots; plant in gritty, free-draining soil and water sparingly, letting it dry between drinks.
Why is my silver thyme woody, bare centre?
Old plants go leggy and woody in the middle. Trim lightly after flowering each year and replace plants every few years from cuttings to keep them dense.
Why is my silver thyme loss of variegation (reversion)?
Plain green shoots sometimes appear on variegated thyme. Cut these out promptly or they outcompete and overtake the slower silver-marked growth.
Why is my silver thyme winter wet damage?
More likely to die from cold, wet soil than from cold itself. Ensure sharp drainage and consider a gritty mulch or container that can be sheltered in a wet winter.