Common Comfrey

How to grow Common Comfrey

Written by the GardenDecoded editorial team · Last reviewed 21 July 2026 · Written for UK gardens · How we research our guidance

Planting

Plant in spring or autumn where it can stay — the roots go deep and it is very hard to remove once settled. A damp corner, the edge of a wild area or a dedicated bed near the compost heap all work better than a mixed border.

Pruning

Cut the whole plant to near ground level two or three times between late spring and late summer. It regrows quickly, and the cut foliage is the traditional raw material for comfrey liquid feed or as a nitrogen-rich compost activator.

Propagation

Divide in spring or autumn, or take root cuttings in winter — even short pieces of root will grow. This ease of propagation is exactly why it is so persistent when you want it gone.

Pests and diseases

Largely untroubled. Rust and mildew occasionally mark the leaves late in the season; cutting the plant down clears it.

Value to wildlife

The nodding tubular flowers are heavily worked by long-tongued bumblebees, and short-tongued bees often bite through the base of the flower to reach the nectar. Early and prolific enough to matter in spring.

Notes

This species sets viable seed and spreads, unlike the sterile Bocking cultivars grown for green manure. If you want comfrey purely for feed and not for the wildflower value, a sterile clone is the less invasive choice.

This guidance was researched and written by GardenDecoded — see our editorial policy for how guides are checked and reviewed.

Other names for this plant

These names have all been used for Symphytum officinale but are no longer the accepted name. You may still meet them on old labels, in books, or in nursery catalogues.

Others in Symphytum