Clinopodium alpinum: complete guide

Overview

Clinopodium alpinum, commonly known as Alpine calamint or Alpine basil thyme, is a compact, aromatic herb from the Lamiaceae or mint family. This European alpine plant ranges from central Europe through the Mediterranean. Growing to just 10-25 cm in height, it forms tight, compact mats with fine foliage. The plant blooms June through August with purple-pink flowers. This represents an excellent choice for alpine gardens, rock gardens, and troughs.

Appearance and bloom

Clinopodium alpinum forms dense, compact mats with very fine, small leaves. Foliage is oval, green, and intensely aromatic. When touched, leaves release a strong, pleasant scent reminiscent of mint and oregano. Flowers appear June through August, small, purple-pink to violet-tinted. The blooms prove highly attractive to bees and butterflies. This plant remains evergreen or semi-evergreen year-round.

Ideal location

Clinopodium alpinum grows best in completely sunny positions in alpine or mountain gardens. The plant requires abundant light; shade causes leggy growth and fewer flowers. Good ventilation is essential. Position it in elevated, windy locations in alpine rock gardens or troughs. This plant is perfect for full sun on dry, exposed sites.

Soil

Clinopodium alpinum demands excellent drainage with poor fertility. Add gravel, perlite, or pumice for outstanding drainage. This plant thrives on lean soils; rich feeding causes excessive growth. pH can range from acidic to alkaline (pH 5-9). This plant grows better on calcareous soils than acidic ones. Poor, stony, or sandy substrates are ideal.

Watering

Clinopodium alpinum is extremely drought-tolerant. Once established it requires minimal water. Do not allow complete drying during growth season, but ensure rapid drainage. Waterlogging kills this plant. In winter, almost no water is needed. This is a very water-efficient plant.

Pruning

Clinopodium alpinum requires virtually no pruning. Remove only spent flowers or damaged foliage. The plant grows compactly and requires no thinning. A light clean-up after bloom is optional.

Maintenance calendar

APRIL-MAY: Growing season starts, minimal water. JUNE-JULY-AUGUST: Peak bloom period, minimal watering. SEPTEMBER-OCTOBER: Bloom ends, monitor drainage. NOVEMBER-MARCH: Winter dormancy, keep dry.

Winter hardiness

This plant is extremely hardy to zone 4 (below -30°C). Alpines tolerate some winter desiccation. No extra protection ever needed.

Companion plants

Clinopodium alpinum combines beautifully with other alpine herbs like Thymus, Teucrium, and Origanum. Perfect in rock gardens with small alpines. Lovely with other purple-pink bloomers.

Final thoughts

Clinopodium alpinum is an essential plant for alpine gardeners. Aromatic, hardy, and extremely low-maintenance. Available from specialty alpine nurseries worldwide. Once established, this jewel will perform reliably for many years.