English thyme is the foundational culinary thyme — the aromatic, slightly camphoraceous herb of roasting, soups, and bouquet garni. It thrives on neglect in lean, well-drained soil and full sun. Overwatering or rich soil produces rank, flavourless growth. The tiny pink flowers attract bees and are edible.
Cut back by one-third after flowering to keep plants compact and productive. Individual plants become woody after 3–4 years and should be replaced with rooted cuttings.
Root rot
Plants wilt, yellow, and stunt even in moist soil; lower stems and roots turn brown, soft, and mushy and the plant may collapse. Most common in heavy, wet, or poorly drained ground.
Improve drainage and stop overwatering, and never plant too deep. Lift and destroy badly affected plants along with the soil around the roots. Grow in raised or free-draining beds to prevent it returning.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.
Botrytis (grey mould)
Grey fuzzy mould on petals and stems, worst in cool wet conditions.
Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.