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Butterbur

Petasites hybridus · Asteraceae

The gardener's calendar

The right move for September

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

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ID card

Foliage
Deciduous
Flowering
February to April
Mature size
0.5 to 1.2 m in height
Growth
Fast and vigorous
Hardiness
Very hardy (–15 °C)
Origin
Temperate Europe and Western Asia
Soil type
Rich, moist, alluvial soil

Care

Watering

Butterbur appreciates consistently moist soil. Water regularly during the growing season, especially during dry spells. In autumn and winter, moderate moisture is sufficient. Plant it preferably near a water source or in a naturally humid area to minimize artificial watering.

Light exposure

Install butterbur in partial shade or full shade. Although it tolerates full sun, it prefers dappled light, especially in warm regions. This exposure also limits soil desiccation and promotes lusher foliage.

Soil

Enrich the soil with compost or potting soil at planting. Butterbur thrives in soil rich in organic matter and well-drained, but capable of retaining moisture. Peaty or enriched alluvial soil is ideal for guaranteeing optimal growth.

Pruning and maintenance

Little pruning is needed. Remove damaged or diseased leaves in spring. If the plant becomes invasive, cut stems to ground level in late autumn. Control root expansion by delimiting the planting area with an underground barrier.

Fertilizer

An application of well-decomposed compost in spring is generally sufficient. In poor soil, apply a balanced organic fertilizer once or twice per season. Avoid excesses that would stimulate overly invasive growth at the expense of flowering.

Diseases and pests

Butterbur is generally robust. Watch for powdery mildew in overly dry conditions and slugs in very moist soil. Good drainage during the winter period prevents root rot. Regularly aerate the base of the plant to promote good air circulation.

Did you know?

Used since antiquity in traditional medicine, notably by the Greeks and Romans, butterbur earned its "officinal" name from its reputed virtues. Its massive leaves (able to reach 1 m in diameter!) unfold after winter flowering, creating a natural parasol effect that protects other woodland plants.

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.