Comfrey

Profile

Family

Boraginaceae

Habit

perennial

Height

1.2 m

Spread

1.8 m

Growth

very fast

Lifespan

20 years

First yield

after 1 year

Hardiness

zone 5–9

Shade tolerance

partial shade

Soil

Sand, Silt, Loam, Clay

Soil moisture

dry – very wet

pH

5 – 8

Synonyms

Comfrey, Beinwurz

Planned in gardens

6×

Flowering & harvest

Times apply to the northern hemisphere in a temperate climate and shift with altitude and cultivar.

Uses

Edible: Young leaves can be consumed either raw or cooked, although their hairy and slimy texture may not be appealing to many. To reduce the hairiness, they can be finely chopped and added to salads. Young shoots can serve as a replacement for asparagus, and blanched stems are also utilized. Older leaves can be dried for tea consumption. The peeled roots, when crushed, can enhance the flavor of soups. Both leaves and roots, when dried, can be used to make tea. Roasted roots, including dandelion and chicory roots, are employed in making coffee.

Medicinal: Comfrey is a widely used herbal remedy with a well-established history in treating various conditions. Both the root and leaves are utilized, with the root being more potent. It can be used internally or applied topically as a poultice. The plant is effective in treating external issues like cuts, bruises, sprains, wounds, eczema, varicose veins, and fractures. Internally, it helps with lung problems, internal bleeding, and more. Comfrey contains allantoin, a healing agent that speeds up the recovery process. This compound is now artificially produced in pharmaceuticals for healing creams. The root and leaves have various properties such as pain relief, mild astringent, soothing, moisturizing, expectorant, cooling, and wound healing. Caution is advised, especially when using it internally. External use and teas made from the leaves are safe, but internal tablets or capsules are considered risky. Leaves are harvested in early summer before flowering, while roots are collected in autumn, both dried for future use. A homeopathic treatment is derived from fresh roots harvested pre-bloom, mainly used for bone fractures and eye injuries.

Other uses: The plant grows rapidly, yielding a significant amount of biomass. It can be harvested multiple times annually and utilized as immediate compost for crops such as potatoes. The dried leaves can be placed at the base of the potato trench or used as mulch in no-dig gardens. Additionally, the leaves can be soaked to create a liquid fertilizer, beneficial for potassium-demanding plants like tomatoes. They are also a beneficial component for composting. Historically, the gum obtained from the roots was employed in wool treatment prior to spinning.

Propagation

Seeds should be sown in a cold frame either in spring or autumn. Once they reach a suitable size, transfer the seedlings to individual pots and nurture them in a greenhouse during the initial winter. By late spring or early summer, after the final frosts, relocate them to their permanent planting spot. If there are sufficient seeds, consider outdoor sowing in spring. Division is possible at any time of the year. Using a shovel, trim the top 7 cm of the root just below the soil surface. The original root will regenerate, yielding multiple root segments, each capable of developing into a new plant. These segments can be potted or directly planted in their permanent spot.

Notable

Special features: highly tolerant to pruning, guards against nutrient leaching. The Bocking No. 4 type is especially flavorful; Bocking No. 14 does not spread on its own; propagation through root division is simple (can be done at any time); its taproot pulls nutrients from deep soil levels to its leaves, acting as immediate mineral compost for plants with shallow roots.

Origin & habitat

Europe, from southern and eastern Scandinavia to Spain, Siberia, and Turkey.

A widely distributed and versatile plant commonly seen in hedges, forests, grasslands, and other habitats.

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