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Stemless gentian

Gentiana acaulis · Gentianaceae

The gardener's calendar

The right move for September

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

JFMAMJJASOND Planting

ID card

Foliage
Evergreen, in basal rosette
Flowering
April to May
Adult size
5 to 10 cm in height
Growth
Slow
Hardiness
Very hardy (down to -20°C)
Origin
Alps and Pyrenees
Soil type
Well-drained, calcareous, slightly acidic to neutral

Care

Exposure

Choose a sunny or partially shaded location. In warm climates, light afternoon shade is beneficial. Good light promotes abundant and vigorous flowering.

Soil and planting

Plant your gentian in well-drained soil that is never waterlogged, adding gravel or pumice. It tolerates calcareous soil but prefers slightly acidic conditions. Adding leaf mold improves structure.

Watering

Keep the soil moist but never soggy. During the growing season (spring), water regularly. In winter, reduce watering. Avoid stagnant moisture that can cause collar rot.

Fertilizing

A light application of balanced fertilizer in spring is sufficient. Limit yourself to one feeding, as excess nitrogen damages flowering and promotes disease. Prefer well-decomposed compost applied to the surface.

Cleaning and maintenance

Remove spent flowers to encourage prolonged blooming. Remove dead or damaged foliage in late winter. No drastic pruning is necessary; the plant naturally forms a compact rosette.

Diseases and pests

Watch for collar rot and root rot linked to excess moisture. Slugs can damage young foliage. Ensure optimal drainage and air circulation to prevent fungal diseases.

Did you know?

Koch's gentian has fascinated botanists for centuries due to its deep blue flowers of remarkable beauty, but also its rarity to flower in cultivation. It takes its name from German botanist Carl Koch and remains a prestige plant in the rock gardens of collectors. Its roots, traditionally used in the Alps for making digestifs, make it a plant of multiple regional virtues.

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.