Thyme in April: monthly care

Thyme thrives in full sun and well-drained soil, making it ideal for sunny borders, rockeries, gravel gardens, or containers. It tolerates sandy, chalky, and loam soils but abhors waterlogging, so excellent drainage is essential. If your soil is heavy clay, work in plenty of grit or sharp sand before planting, or grow thyme in raised beds or pots filled with a gritty, free-draining compost. Plant thyme in April, May, or September when the soil is workable and temperatures are mild. Space plants 25 cm apart to allow for their spreading habit, which typically reaches 20–40 cm across. Dig a hole slightly larger than the root ball, set the plant at the same depth it was growing in its pot, and firm the soil gently around the roots. Water in lightly after planting, but avoid saturating the soil. If planting from seed, sow thinly on the surface of moist, gritty compost in spring, as thyme seeds need light to germinate. Keep at around 15–20°C and transplant seedlings once large enough to handle, hardening them off before planting out after the last frosts. After planting, water sparingly until the plant is established—thyme is drought-tolerant once its roots have settled in. A thin layer of gravel or grit mulch around the base helps suppress weeds, improves drainage, and reflects heat, which thyme appreciates. Avoid organic mulches like compost or bark, which retain moisture and can encourage rot. Thyme is hardy to zone 5a and evergreen in our climate, so it will provide year-round interest and foliage for picking.

Thyme benefits from light pruning twice a year to maintain a compact, bushy shape and prevent the plant from becoming woody and leggy. Prune in April and again in August, using clean, sharp secateurs or garden shears. In April, as new growth begins to emerge, trim back the previous year's growth by about one-third. Cut just above fresh green shoots, avoiding cutting into old, bare, woody stems, as thyme is reluctant to regenerate from very old wood. This spring prune encourages dense, leafy growth and helps the plant stay neat and productive throughout the growing season. The second prune in August should be lighter. After the main flowering period has finished, trim off the spent flower heads and the top few centimetres of soft growth. This tidies the plant, prevents it from self-seeding everywhere, and stimulates a fresh flush of aromatic foliage before autumn. Again, avoid cutting back hard into woody stems. If you harvest thyme regularly for cooking throughout the growing season—particularly from May to September—you may find that pruning is less necessary, as picking naturally keeps the plant compact. However, even well-harvested plants benefit from a spring tidy-up. Neglected or very old thyme plants that have become sparse and woody in the centre are difficult to rejuvenate. If your thyme reaches this stage, it's often easier to replace it with a young plant or take softwood cuttings in early summer to propagate fresh stock.