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Dracocephalum ruyschiana

Dracocephalum ruyschiana · Lamiaceae

The gardener's calendar

The right move for September

Ideal time to plant dracocephalum ruyschiana: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Common name
Ruysch's Dragon Head
Family
Lamiaceae (mints)
Form
Herbaceous perennial
Adult size
30 to 60 cm tall
Flowering
June to August, blue-violet flowers
Foliage
Deciduous, medium green, narrow
Hardiness
Down to -20°C
Origin
Mountains of Central Asia and the Caucasus

Care

Exposure

Plant this specimen in full sun for generous blooming: at least 6 hours of direct light daily. It tolerates partial shade but will flower less abundantly. Avoid dense shade, which slows growth.

Watering

Water regularly during growth and flowering, keeping the soil lightly moist but not waterlogged. In winter, reduce watering. Prefer watering in the morning at the base to avoid wetting the foliage.

Soil and drainage

Use well-draining, light soil, preferably poor to average. A perennial plant mix with added sand or gravel works perfectly. Avoid overly rich soils that promote foliage at the expense of flowers.

Pruning and maintenance

In late winter or early spring, cut the plant back lightly to encourage vigorous branching. After flowering, you can remove spent flowers to stimulate further blooming.

Fertilizing

Apply balanced or nitrogen-poor fertilizer in spring. Excessive feeding promotes foliage at the expense of flowers. A single application at the start of the season usually suffices.

Diseases and pests

The plant is generally robust and rarely affected by disease. Monitor for stagnant moisture that could cause root rot. Few insects truly affect it; good air circulation prevents most problems.

Did you know?

Dracocephalum ruyschiana is named after the Dutch botanist Frederik Ruysch, a great collector of rare plants in the 17th century. Its Greek etymology—'drakos' (dragon) and 'kephalos' (head)—evokes the singular shape of its zygomorphic flowers. This small alpine perennial was once highly prized in Victorian English rock gardens for its pure, luminous blue blooms.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.