Symphytum officinale

Comfrey

Symphytum officinale

Zones 2-5

The leaves, which can be harvested several times a season, are used as a compost activator helping the breakdown of other compost materials. Also used as a mulch, or is superb used as a liquid manure on tomato and potato plants. Sow March to June in a seedbed or indoors. Harvest (cut leaves) regularly throughout the summer and autumn. Height to 120cm (4ft).