Comfrey (also comphrey) is an important herb in organic gardening, having many medicinal and fertilizer uses.
Comfrey (Symphytum officinale L.) is a perennial herb of the family Boraginaceae with a black, turnip-like root and large, hairy broad leaves that bears small bell-shaped white, cream, light purple or pink flowers. It is native to Europe, growing in damp, grassy places, and is widespread throughout Ireland and Britain on river banks and ditches. Comfrey has long been recognised by both organic gardeners and herbalists for its great usefulness and versatility; of particular interest is the “Bocking 14” cultivar of Russian Comfrey (Symphytum x uplandicum). This strain was developed during the 1950s by Lawrence D Hills, the founder of the Henry Doubleday Research Association (the organic gardening organisation itself named after the Quaker pioneer who first introduced Russian Comfrey into Britain in the 1910s) following trials at Bocking, near Braintree, the original home of the organization.
Other species include:
- Symphytum asperum, Prickly Comfrey, Rough Comfrey (synonym: S. asperrimum)
- Symphytum bulbosum, Bulbous Comfrey
- Symphytum caucasicum, Caucasian Comfrey
- Symphytum ibericum, Creeping Comfrey
- Symphytum orientale, White Comfrey
- Symphytum tauricum, Crimean Comfrey
- Symphytum tuberosum, Tuberous Comfrey
- Symphytum x uplandicum, Russian Comfrey, Healing Herb, Blackwort, Bruisewort, Wallwort, Gum Plant. (S. asperum x officinale, synonym: S. peregrinum)
(all of these comfreys are poisonous)
The comfrey bed should be well prepared by weeding thoroughly, and dressing with manure if available. Offsets should be planted 2–3 feet apart with the growing points just below the surface, whilst root segments should be buried about 2 inches deep. Keep the bed well watered until the young plants are established. Comfrey should not be harvested in its first season as it needs to become established. Any flowering stems should be removed as these will weaken the plant in its first year. Comfrey should also be regularly watered until well established.
Comfrey is a fast growing plant, producing huge amounts of leaf during the growing season, and hence is very nitrogen hungry. Although it will continue to grow no matter what, it will benefit from the addition of animal manure applied as a mulch, and can also be mulched with other nitrogen rich materials such as lawn mowings, and is one of the few plants that will tolerate the application of fresh urine diluted 50:50 with water, although this should not be regularly added as it may increase salt levels in the soil and have adverse effects on soil life such as worms. Mature comfrey plants can be harvested up to four or five times a year. They are ready for cutting when about 2 feet high, and, depending on seasonal conditions, this is usually in mid-Spring. Comfrey will rapidly regrow, and will be ready for further cutting about 5 weeks later. It is said that the best time to cut comfrey is shortly before flowering, for this is when it is at its most potent in terms of the nutrients that it offers. Comfrey can continue growing into mid-Autumn, but it is not advisable to continue taking cuttings after early Autumn in order to allow the plants to build up winter reserves. As the leaves die back and break down in winter, nutrients and minerals are transported back to the roots for use the following spring.
Comfrey should be harvested by using either shears a sickle or a scythe to cut the plant about 2 inches above the ground, taking care handling it because the leaves and stems are covered in hairs that can irritate the skin. It is advisable to wear gloves when handling comfrey. Despite being sterile, Bocking 14 Russian Comfrey will steadily increase in size. It is therefore advisable to split it up every few years (and at the same time propagate more plants that can be shared with fellow gardeners!). It is however difficult to remove comfrey once established as it is very deep rooting, and any fragments left in the soil will regrow. Rotovation can be successful, but may take several seasons. The best way to eradicate comfrey is to very carefully dig it out, removing as much of the root as possible. This is best done in hot, dry summer weather, wherein the dry conditions will help to kill off any remaining root stumps. Comfrey is generally trouble free once established, although weaker or stressed plants can suffer from comfrey rust or mildew. Both are fungal diseases, although they rarely seriously reduce plant growth and thus do not generally require control. However infected plants should not be used for propagation purposes.
Contemporary herbalists view comfrey as an ambivalent and controversial herb that may offer therapeutic benefits but can cause liver toxicity.
One of the country names for comfrey was ‘knitbone’, a reminder of its traditional use in healing. Modern science confirms that comfrey can influence the course of bone ailments
The herb contains allantoin, a cell proliferant that speeds up the natural replacement of body cells. Comfrey was used to treat a wide variety of ailments ranging from bronchial problems, broken bones, sprains, arthritis, gastric and varicose ulcers, severe burns, acne and other skin conditions. It was reputed to have bone and teeth building properties in children, and have value in treating "many female disorders". In past times comfrey baths were popular to repair the hymen and thus "restore virginity" Constituents of comfrey also include mucilage, steroidal saponins, tannins, pyrrolizidine alkaloids, inulin, and proteins.
Internal usage of comfrey should be avoided because it contains hepatotoxic pyrrolizidine alkaloids (PAs). (Note: there are also non-hepatotoxic pyrrolizidine alkaloids.) Use of comfrey can, because of these PAs, lead to veno-occlusive disease (VOD). VOD can in turn lead to liver failure, and comfrey, taken in extreme amounts, has been implicated in at least one death. In 2001, the United States Food and Drug Administration issued a warning against internal usage of herbal products containing comfrey. There are ways to remove the pyrrolizidine alkaloids from comfrey, and some herbal product manufacturers have begun doing so (although the products will still be labelled “for external use only”). Merck produces a commercially available product called Kytta-Salbe from which >99% of the pyrrolizidine alkaloids have been removed (see Grube et al. 2007. Phytomedicine 14: 2-10).
Excessive doses of Symphytine, one of the PAs in comfrey, may cause cancer in rats. This was shown by injection of the pure alkaloid. The whole plant has also been shown to induce precancerous changes in transgenic rats.
The flower was used in the Middle Ages to help relieve lung problems caused by black death.
Most recently, in a placebo controlled study published by Giannetti et al., Comfrey was found to decrease back pain when used topically. It is not clear if these results reached statistical significance.
Comfrey is a particularly valuable source of fertility to the organic gardener. It is very deep rooted and acts as a dynamic accumulator, mining a host of nutrients from the soil. These are then made available through its fast growing leaves (up to 4-5 pounds per plant per cut) which, lacking fibre, quickly break down to a thick black liquid. There is also no risk of nitrogen robbery when comfrey is dug into the soil as the C:N ratio of the leaves is lower than that of well-rotted compost. Comfrey is an excellent source of potassium, an essential plant nutrient needed for flower, seed and fruit production. Its leaves contain 2-3 times more potassium than farmyard manure, mined from deep in the subsoil, tapping into reserves that would not normally be available to plants.
There are various ways in which comfrey can be utilised as a fertiliser, these include:
- Comfrey as a compost activator - include comfrey in the compost heap to add nitrogen and help to heat the heap. Comfrey should not be added in quantity as it will quickly break down into a dark sludgy liquid that needs to be balanced with more fibrous, carbon rich material.
- Comfrey liquid fertilizer - can be produced by either rotting leaves down in rainwater for 4–5 weeks to produce a ready to use 'comfrey tea', or by stacking dry leaves under a weight in a container with a hole in the base. When the leaves decompose a thick black comfrey concentrate is collected. This must be diluted at 15:1 before use.
- Comfrey as a mulch or side dressing - a 2 inch layer of comfrey leaves placed around a crop will slowly break down and release plant nutrients; it is especially useful for crops that need extra potassium, such as fruit bearers but also reported to do well for potatoes. Comfrey can be slightly wilted before application optionally but either way, avoid using flowering stems as these can root.
- Comfrey potting mixture - originally devised to utilize peat, now environmental awareness has led to a leaf mold-based alternative being adopted instead; two year old, well decayed leaf mold should be used, this will absorb the nutrient-rich liquid released by the decaying comfrey. In a black plastic sack alternate 3-4 inch layers of leaf mold and chopped comfrey leaves. Add a little dolomitic limestone to slightly raise pH. Leave for between 2–5 months depending on the season, checking that it does not dry out or become too wet. The mixture is ready when the comfrey leaves have rotted and are no longer visible. Use as a general potting compost, although it is too strong for seedlings.