Species of the Month: Comfreyby Douglas BarnesComfrey (
Symphytum officinale). What better plant to feature as Species of the Month than this herbaceous member of the Boraginaceae family?
Description
It
grows up to 150 cm tall and 60 cm in diameter in warm climates. The
optimum growth is in climates where day and night are equal (i.e. the
tropics). There, production of 100 to 200 tons per acre (roughly 250 to
500 metric tons per hectare) is possible! However, it will grow in
temperate regions. It prefers full sun and soils rich in nitrogen and
humus, so interplanting with nitrogen fixers and mulching is a good
idea. You can expect to get at least 10 years out of one plant, and a
well-attended plant might outlive you!
Animal FodderIt
is protein rich with reportedly 20 times the protein content of soy
beans. It is used as a pig fodder successfully in amounts up to 80 to
90% of the diet! For poultry, it can reduce the need for other feed (be
that your concoction or processed feed) by 50%. Egg quality will
improve with yolks being brighter. Cows don't bloat when eating comfrey
like they do with clover. And too much clover can taint the milk – not
a problem with comfrey. Also, mastitis is reduced in cows fed comfrey.
Wilted comfrey mixed with straw fed to sheep at a ratio of one part
comfrey to one and a half parts straw increases the digestion of the
straw. The flowers make it useful as bee fodder. It is used in zoos as
fodder for many (expensive) animals. Its tremendous production rates
make it a great elephant feed.
Soil ImprovementComfrey
has deep roots that help it to draw up nutrients from subsoils. This
characteristic makes it a valuable nutrient cycler. It accumulates
nitrogen, potassium, phosphorus, calcium, zinc, manganese, magnesium,
copper, sodium, sulfur, chromium, molybdenum and lead (the latter might
make it useful in cleaning roadside soils contaminated by the use of
leaded gasoline). It can be used as a green manure, and its ability to
be cut right down to the ground a few times a year helps in this
respect. It can be used as a compost activator.
It can be made into a liquid plant feed:
Place harvested comfrey in a sealable bucket
Weigh down the comfrey with a stone
Wait 1 or 2 weeks
Drain out the juice and dilute it 10 to 1 with water and water your plants with it
You can also use it to fill niches to suppress weeds.
As FoodTraditionally
the whole plant has been used. Young leaves can be added to salads in
small quantities to boost nutrient uptake. The stems can be blanched
and eaten like asparagus. It is the only known plant source of vitamin
B12.
As MedicineContains
allantoin, which assists in the repair of damaged tissues. It is used
as a poultice for cuts, scrapes, burns, skin conditions, ulcers, broken
bones, strains and aches. It can help with digestive problems. The
juice from leaves can be rubbed into the coats of dogs with mange.
The full catalogue of uses is:
Vulnerary (wound healer)
Astringent (contracts tissue making it useful to treat bleeding, peptic ulcers, diarrhoea, shrink mucus membranes, etc.)
Expectorant (dissolves mucus making it useful in treating phlegm)
Emollient (smoothes and softens skin)
Demulcent (treats inflamed, irritated tissue by coating it – e.g. treating a dry cough)
Antiseptic (helps treat or prevent infection in wounds)
Nutritive (along with its protein and minerals, it contains vitamin B1, B2, B3, B5, B6, B12, C, E and 28,000 IU of vitamin A per 100g)
Tonic
Styptic (helps stop bleeding)
Antioxidant (from the rosmarinic acid it contains)
Pest ControlSlugs
go for comfrey, so you could use it to attract slugs away from plants.
If you really want to go all out against slugs, grow a ring of comfrey
around your garden, separating the garden with an electric fence. The
comfrey will attract the slugs from the garden. Then run pigs in the
comfrey. The pigs will love both the comfrey and the slugs. And the pig
urine and manure will attract in even more slugs, hopefully depleting
your local population for a while. In place of the pigs, poultry could
be run as well.
Caution Needed?Comfrey
does contain pyrrolizidine alkaloids which have the potential for liver
damage. There have been warnings put out against the use of the herb,
but evidence of incontrovertible documented toxicity is lacking. In the
book "The Safety of Comfrey," J.A. Pembery found no reported cases of
pyrrolizidine poisoning from comfrey. He did find one case of pigs in
Germany being poisoned by nitrates in comfrey, but not by
pyrrolizidine. Lab tests on rats suggest that to cause harm to humans,
one would have to eat about 20,000 leaves. Certainly from anecdotal
evidence, many people have eaten comfrey without reservations for
decades and been very healthy. Still, to err on the side of caution,
limit consumption. Also, drying the comfrey reduces the amounts of
alkaloids.