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Comfrey

Symphytum officinale · Boraginaceae

The gardener's calendar

The right move for September

Ideal time to plant comfrey: 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
May to July, pale pink, purple or white flowers
Adult size
24 to 47 inches tall × 24 inches wide
Growth
Fast
Hardiness
Very hardy (down to -4°F)
Origin
Temperate Europe and Asia
Soil type
Rich, moist, well-draining
Exposure
Part shade to full sun

Care

Watering

Water regularly during the growing season (spring-summer) to keep the soil moist without waterlogging. Once established, comfrey tolerates drought well and requires little water. Avoid wetting the foliage to prevent fungal diseases.

Exposure

Plant in part shade to full sun. Comfrey adapts to various light conditions but flowers more abundantly in sun. It also tolerates partial shade, ideal for warmer areas in summer.

Soil and planting

Prefer soil rich in organic matter, moist and well-draining. Enrich the soil with compost before planting. Comfrey adapts to various soils but performs better in fertile soil without waterlogging.

Pruning and maintenance

Deadhead spent flowers to encourage continuous blooming. In autumn, cut the plant back to ground level after foliage dries. Leaves can be harvested as needed and are valued in the garden for their enriching properties.

Fertilizing

An application of well-decomposed compost in spring is generally sufficient. Comfrey is not demanding and does not require regular fertilizer. Organic mulch will gradually enrich the soil.

Diseases and pests

Very hardy, it is rarely affected by pests. Watch for powdery mildew and rot in case of excess moisture or waterlogging. Space plants to ensure good air circulation between foliage.

Did you know?

Common comfrey is a major historical plant: in the Middle Ages and Renaissance, it was renowned for consolidating bone fractures, hence its Latin name 'Symphytum' meaning 'that which unites'. Cherished in European peasant gardens for centuries, it even appears in ancient medical treatises, though its internal uses are now discouraged without medical advice.

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.