Any flowering stems should be removed as these will weaken the plant in its first year.
Comfrey is a fast-growing plant, producing huge amounts of leaf during the growing season, and hence is very nitrogen hungry.
It is one of the few plants that will tolerate the application of fresh urine diluted with water, although this should not be regularly added as it may increase salt levels in the soil and have adverse effects on soil life such as worms.
Keep the bed well watered until the young plants are established.
Comfrey should not be harvested in its first season as it needs to become established.
It is native to Europe, growing in damp, grassy places, and is locally frequent throughout Ireland and Britain on river banks and ditches. The comfrey bed should be well prepared by weeding thoroughly, and dressing with manure if available.
Offsets should be planted 0.6–1 m (2 ft 0 in–3 ft 3 in) apart with the growing points just below the surface, while root segments should be buried about 5 cm (2.0 in) deep.