The Gardeners Almanac

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Comfrey

Common name: Knitbone

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Clay soil

Composting

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Fertiliser

Root cuttings

Soil preparation

Leafy Plant

Comfrey symphytum officinale
Overview:

Comfrey symphytum officinale is a very versatile plant to have around in the allotment or garden, particularly if you are growing organically.

It is a frost hardy herbaceous plant that will thrives in most types of soil.

Under its common name knitbone it was traditionally used in the past as a poultice to heal broken bones.

It is high in calcium, which may be why it was used in that way.


Cultivation:

Propagation is by root division so you may have to cajole a neighbour for a piece of root in order to get started.

Be careful when growing this plant as it can be a bit of a thug, it spreads quite rapidly and may establish itself in areas where you don't wish it to.

Consider containing the root system in a bottomless bucket or similar.


Properties and Uses:

Comfrey is a complete fertiliser in so far as: its leaves are full of calcium, iron, magnesium, nitrogen, and potassium.

The leaves can be harvested growth several times a year from mid spring onwards, and the aforementioned properties make it an ideal compost activator in the compost heap.


Its uses are many, here are a few;


Method:

Place comfrey leaves in a container add a small amount of water and leave for a week or two.

Drain off the liquid produced and then dilute it by adding ten parts clean water to one part comfrey liquid.

This resulting liquid feed is excellent for supplying potassium hungry crops, for example tomatoes.