Step-by-Step Growing Guide
Thyme is a compact, woody Mediterranean herb that thrives in poor, well-drained, alkaline-leaning soil at pH 6.0–8.0. Plant in the least fertile, most sun-drenched spot in the garden — excessive fertility produces soft, flavourless growth. Amend clay soils with 50% coarse grit before planting; raised beds or rock garden walls work beautifully. Space plants 20–30cm apart; they spread to about 30–40cm wide at maturity. Plant at nursery pot depth. Once established (after the first season), thyme is extremely drought-tolerant — water only when the top 5–8cm of soil is completely dry, roughly every 10–14 days in summer. Overwatering is the primary cause of thyme death. Do not fertilise — it is counterproductive. After the spring or summer flowering flush, cut the plant back by one-third with sharp shears to prevent it becoming straggly and woody from the base. Thyme is hardy to -10°C when well-drained; wet winter soil is more dangerous than cold.