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Aconitum septentrionale

Aconitum septentrionale · Ranunculaceae

The gardener's calendar

The right move for September

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

JFMAMJJASOND Planting

ID card

Common name
Northern monkshood, Wolfsbane
Family
Ranunculaceae
Type
Perennial herbaceous plant
Mature size
80 to 150 cm tall
Flowering
July to September, blue-violet flowers
Foliage
Deciduous, deeply cut and finely divided
Hardiness
Very hardy, down to -20 °C
Origin
Mountainous regions of northern Europe

Care

Light exposure

Choose a location in partial shade or full sun depending on your climate. Monkshood tolerates semi-shaded areas well, particularly in warm regions where partial shade protects from water stress. An airy spot promotes good growth.

Soil

Plant in rich, well-draining, slightly moist and fertile soil. Monkshood prefers slightly acidic to neutral soil enriched with organic matter. Avoid permanent waterlogging, which can promote root rot.

Watering

Water regularly during the growing season to keep the soil moist, especially in dry weather. Reduce watering in autumn and winter when the plant goes dormant. Let the soil dry slightly between waterings to prevent root suffocation.

Fertilizing

Apply balanced fertilizer in spring when growth resumes. An annual addition of well-decomposed compost naturally enriches the soil. A light second application in early summer supports flower formation.

Pruning and cutting

Remove faded flowers to extend flowering and prevent self-seeding. In late autumn, cut back the dried foliage to ground level. Clean up dead stems in spring.

Diseases and pests

Monkshood is generally robust. Watch for powdery mildew in case of excessive humidity and poor air circulation. Slugs may damage young leaves in spring; mulching with good aeration limits damage. No major pests typically affect it.

Did you know?

Northern monkshood was long used to make poisons for hunting weapons in medieval Europe. This plant, extremely toxic in all its parts, fascinates botanists and historians with its ritual and military use, earning it the evocative nickname Wolfsbane. Today, it remains a spectacular garden plant despite its danger, admired for its beauty and ecological role in the mountains.

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.