Troubleshooting
Tommies Crocus problems — and how to fix them
Tommies Crocus (Crocus tommasinianus) 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.
Overcrowding after self-seeding
Tommies spread so freely that clumps can become congested after 5–6 years, leading to smaller flowers and crowded corms. Lift, divide, and replant every 4–5 years in late summer when corms are dormant.
Botrytis and corm rot
Persistent waterlogging or poorly draining soil causes fungal rot of the corms. Improve drainage with added grit at planting; avoid sites prone to winter standing water. Remove and discard any rotted corms.
Bird damage to flowers
House sparrows and other birds peck at the open blooms, particularly purple-flowered forms, destroying petals. Protect with low black-thread or fine bird-deterrent net strung just above the flowers during the brief flowering period.
Prevent tommies crocus problems before they start
Most tommies crocus issues are care-mismatch, not bad luck. Dial in the basics:
Looking for tommies crocus in general rather than its problems? Read the full tommies crocus care guide — light, water, soil and feeding.
Tommies Crocus problems — FAQ
Why is my tommies crocus overcrowding after self-seeding?
Tommies spread so freely that clumps can become congested after 5–6 years, leading to smaller flowers and crowded corms. Lift, divide, and replant every 4–5 years in late summer when corms are dormant.
Why is my tommies crocus botrytis and corm rot?
Persistent waterlogging or poorly draining soil causes fungal rot of the corms. Improve drainage with added grit at planting; avoid sites prone to winter standing water. Remove and discard any rotted corms.
Why is my tommies crocus bird damage to flowers?
House sparrows and other birds peck at the open blooms, particularly purple-flowered forms, destroying petals. Protect with low black-thread or fine bird-deterrent net strung just above the flowers during the brief flowering period.