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.
Thyme Root Rot
Stems blacken at the base, foliage yellows and wilts, and roots turn brown and mushy. Common in heavy or poorly drained soil.
Remove affected plants and avoid replanting thyme in the same spot. Improve drainage with grit or raised beds, and water only when soil is dry.
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.