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 potatoes plants. Grows in any soil, preferably moist, in sun or part shade. Height to 120cm (4ft).
Sow March to June in a seedbed or in pots indoors. Sow thinly, 12mm (½in) deep in drills 30cm (12in) apart. Can also be sown in pots or trays under glass and transplanted.
Keep well-watered until established. Cut leaves regularly throughout the summer and autumn.