Thymus SERPYLLUM

Thymus SERPYLLUM - Creeping thyme, Wild thyme, Breckland thyme, Thymus serpyllum.

Thymus is a genus of aromatic perennial plants, subshrubs, and low dwarf shrubs in the family Lamiaceae, comprising several hundred species distributed in Eurasia, North Africa, and adjacent temperate and Mediterranean regions. Representatives of the genus occur on dry slopes, rocky places, steppe areas, sandy soils, forest edges, in mountainous regions, and other open habitats with good light and well-drained soils.

The genus is characterized by low aromatic plants with stems woody at the base, procumbent, ascending, or erect shoots, and small opposite leaves. The leaves are entire, short-petioled or nearly sessile, from rounded to linear-oblong, often leathery, with essential-oil glands thanks to which the plant possesses a pronounced spicy aroma.

The flowers are small, bilabiate, pink, lilac, purple, white, or light violet, gathered in capitate, verticillate, or elongated terminal inflorescences. The calyx is tubular or bell-shaped, often hairy; the corolla is two-lipped, with four stamens. The fruit breaks up into four small nutlets typical of the family Lamiaceae, with very small, dark seeds maturing in the second half of summer or autumn.

Creeping thyme is a low perennial aromatic subshrub naturally distributed from Europe to Western Siberia. In nature, it occurs on dry sunny spots, sandy and rocky soils, slopes, woodland clearings, heaths, sparse grassy communities, and along roadsides. The plant forms dense sods or carpet mats with creeping woody shoots that can root at the nodes.

The leaves are small, elliptic or oblong-elliptic, usually 3-8 mm (0.12-0.31 in) long, aromatic, with essential-oil glands. Flowering shoots rise above the mat, and the flowers are gathered in compact capitate inflorescences. The corolla is most often pinkish-lilac, purple, or light violet, rarely white. Flowering is usually observed from late spring to mid or late summer, and fruits mature in the second half of summer and autumn.

The practical value of the species is linked to its ornamental, nectar-bearing, culinary-aromatic, and traditional uses. Creeping thyme is grown as a groundcover plant for rock gardens, walkways, retaining walls, dry gardens, and containers. The aboveground part is used as an aromatic addition to teas, sauces, vegetable, meat, and fish dishes, as well as raw material for essential oil and dry herbal blends.

Thyme seeds are very small, dark brown or nearly black, rounded or ellipsoidal, resembling tiny nutlets.

Sowing is carried out in spring or year-round with stable warmth and grow lights available. A light sterile seed-starting substrate based on sifted peat, leaf mold, fine perlite, and a small amount of washed sand is used. Seeds are distributed over the surface, lightly pressed into the moist soil, and either left uncovered or dusted with a barely noticeable layer of sifted substrate or sand. The sowing is moistened from a spray bottle with a weak solution of potassium permanganate or biofungicide, if necessary with the addition of a growth stimulant: SUPERthrive, HB-101, Aminozol, Epin, or Zircon.

The container is covered with a transparent lid or placed in a mini-greenhouse. Temperature is maintained at 18-24 °C (64-75 °F); lighting requires bright diffused light without direct overheating. Ventilation is carried out daily for 10-15 minutes, and the substrate surface is kept evenly moist, but not wet. Overwatering and stagnant condensation quickly cause damping off of tiny seedlings.

The first shoots may appear in 7-14 days; usually germination takes 14-24 days, and the maximum possible period under cool conditions is about 4 weeks. After shoots emerge, the cover is gradually opened slightly, and seedlings are kept under bright diffused lighting and moderate humidity. Pricking out is performed after the formation of 2-3 pairs of true leaves, when the plants are already convenient to handle with a small clump of substrate, and subsequent transplanting into individual small pots is carried out without burying the base of the shoots deeply.

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For thyme, the brightest possible location with direct sun for at least 6 hours a day is used. In open ground, southern slopes, rocky areas, rock gardens, and well-warmed beds without stagnant water are preferred. In container culture, the plant is placed on a south, southeast, or southwest window, and during indoor winter cultivation, supplemental lighting is desirable. With a lack of light, shoots stretch out, the mat becomes loose, and the fragrance of the foliage weakens.

During active growth, a temperature of 18-26 °C (64-79 °F) is maintained; with good ventilation, the plant tolerates summer heat and brief drought. Wintering for a potted plant is preferred cool, at 5-12 °C (41-54 °F), with very moderate watering and bright lighting. In open ground, creeping thyme belongs to winter-hardy plants, but in a container the roots freeze faster, so the pot is protected from prolonged freezing and cold dampness.

Watering is carried out moderately, after thorough drying of the upper soil layer. Thyme tolerates short-term dryness better than constant dampness, so excess water from the drip tray must be drained after 15-20 minutes. In hot weather, watering is increased, but the soil should not remain wet. Water stagnation leads to root rot and mat decline, and an overabundance of moisture reduces the foliage's aromatic potency.

Soil used is lean or moderately nutritious, loose, neutral or slightly alkaline, with very good drainage. A mixture of universal potting soil, coarse sand, fine gravel, limestone chips, or perlite is suitable. Drainage is mandatory at the bottom. Pots are chosen wide and shallow, with drainage holes, as the plant expands like a carpet and does not require heavy, moist soil.

Transplanting container plants is carried out in spring, usually once every 2-3 years, renewing exhausted soil and dividing an overgrown mat. Fertilizer is applied very moderately, 1-2 times per season with a weak solution of complex fertilizer, or not applied at all in sufficiently nutritious soil. Excess nitrogen is undesirable, as it makes shoots loose and reduces fragrance. After flowering, the mat is lightly trimmed to maintain a dense shape, but is not cut back to old bare wood.

Overgrown plants are easily propagated by dividing the mat, layering, and cuttings. Division is carried out in spring or early autumn; rooted portions are planted into loose soil and moderately moistened for the first few days. Cuttings are taken from young shoots during the warm season and rooted in a light substrate under diffused light.