Thymus Vulgaris 'Argenteus

The most common issue is fungal leaf spot/botrytis during cool, humid weather, often showing as dark spots or grayish growth on damp foliage. Remove affected sprigs, improve airflow, and avoid overhead watering; water at the soil line in the morning. If problems persist, use an appropriate fungicide labeled for edible herbs and follow label directions (especially keeping thyme harvest intervals in mind).

Harvest once plants are well established and actively growing, typically around 60 days from sowing; you should be able to cut healthy stems with plenty of leaf mass. Take sprigs just before flowering for the best flavor, and avoid cutting into old, woody bare stems—leave at least a third of the growth so thyme can regrow. For ongoing use, snip small amounts regularly; the plant is ready for repeated harvests after it reaches a sturdy, bushy size.