The back-garden pharmacy

Comfrey (Symphytum officinale)

What is it? Fast-growing tall perennial herb that contains allantoin, which is thought to speed formation of new cells.

How does it help? It can reduce swelling.

How do I use it? Use externally - make a compress with leaves and crushed roots in a clean cotton or linen cloth, and place on sprains and bruises.

Other benefits? Also known as knitbone, some believe it speeds the healing of bone fractures.

What's the evidence? There is scientific evidence that supports topical anti-inflammatory action, but it's inconclusive for other uses such as bone healing.

Quick fix? Comfrey Cream (£4.75, 35g), from www.avogel.co.uk or 01294 277344.