Thymus caespititius aka Azores Thyme

Thymus caespititius is a small evergreen subshrub in the mint family, Lamiaceae. The RHS calls it Azores thyme. Its native range includes Portugal and western and northwestern Spain. It also grows in Macaronesia, including the Azores and Madeira. In the wild, it grows on dry, stony slopes and in gullies. Its native climate is temperate.

This low plant reaches about 0.33 feet (0.1 metres) tall. It spreads to about 1 foot (0.3 metres) across. The leaves stay on the plant throughout the year. Fresh leaves give off a scent like tangerine. Flowers appear from July to August. Each flower has both male and female organs. Bees, flies, moths and butterflies pollinate them. The flowers supply nectar and draw honey bees. These visitors add to its value in small garden spaces.

Grow this thyme in full sun, with free-draining soil. It does not grow in shade. Sandy and loamy soils suit it. It prefers neutral to mildly alkaline soil, including lime-rich ground. Soil may be dry or moist, but should drain well. Wet ground poses a problem, most of all in winter. Gravel around the plant helps keep wet soil off its leaves. Plants For A Future reports hardiness to at least 5°F (−15°C). It lists USDA zones 6–9.

Its small size suits beds, wall crevices and gaps in paths. Plants can take occasional footsteps, though this does not imply heavy wear. Walls facing east, south or west offer possible planting sites. The scented leaves and nectar-rich flowers give it both sensory and wildlife value. Grow new plants from seed or divide plants in spring or autumn. Seed may sprout unevenly. Young seedlings need shelter through their first winter. Plant them out after the last expected frost.

The leaves can season cooked food, fresh or dried. Their citrus scent offers an alternative to lemon-scented thyme. For drying, harvest just before flowering and dry the leaves quickly. The leaves also yield an essential oil used in perfume. Plants For A Future records antiseptic and deodorant uses for the leaves and oil. These reported uses do not establish safe doses for home treatment. That source lists no known hazards, but gives no specific pet-safety evidence.