Comfrey
Symphytum uplandicum · Boraginaceae
The gardener's calendar
Ideal time to plant comfrey: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- April to July, pink, purple or white flowers
- Adult size
- 60–120 cm in height
- Growth
- Fast
- Hardiness
- Very hardy (down to –20 °C)
- Origin
- Hybrid (Symphytum officinale × Symphytum asperum)
- Soil type
- All types, prefers moist and rich
Care
Watering
Comfrey appreciates moist soil but without waterlogging. Water regularly in spring and summer, especially during dry periods. In autumn and winter, reduce watering as the plant enters dormancy. Once well established, it tolerates relative dryness.
Light Exposure
Plant your comfrey in full sun or partial shade. It adapts well to both, but will flower more generously in sunlight. In very hot climates, afternoon shade can be beneficial.
Soil
Comfrey is undemanding and tolerates all soil types. It prefers rich, deep and well-structured soil, however. Adding compost or organic matter at planting accelerates establishment.
Pruning and Cutting
Prune or cut stems after flowering to encourage branching and maintain a compact shape. Leaves and stems can be harvested regularly for compost or liquid manure preparations. Cut back to ground level in autumn.
Fertilizer
Comfrey naturally enriches the soil thanks to its deep roots. A moderate application of balanced fertilizer in spring is sufficient. Too much nitrogen promotes foliage at the expense of flowering.
Diseases and Pests
Very robust, comfrey is rarely affected by diseases or pests. Powdery mildew can appear in hot, humid summers; ensure good air circulation around the plant. Excess water can promote root rot: ensure proper drainage.
Did you know?
Upland comfrey was born from the natural cross between two wild species and spread into cultivation from the 19th century onwards. Very rich in minerals extracted from deep underground, it was traditionally used to prepare a stimulating liquid manure, renowned for revitalizing entire gardens. Old herbalists even called it 'the herb of the land' so omnipresent was it in the countryside.
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.
Add this plant to my garden →Plants from the same family
- BorageBorago officinalis
- Siberian buglossBrunnera macrophylla
- Purple gromwellGlandora diffusa
- Pride of MadeiraEchium candicans
- Viper's buglossEchium vulgare
- ComfreySymphytum officinale
Tips generated and checked by Viridia — adapt them to your local climate.