
Offsets can also be purchased by mail order from specialist nurseries in order to initially build up a stock of plants. The original plant will quickly recover, and each piece can be replanted with the growing points just below the soil surface, and will quickly grow into new plants. This removes the crown, which can then be split into pieces. The gardener can produce "offsets" from mature, strongly growing plants by driving a spade horizontally through the leaf clumps about 7 cm (2.8 in) below the soil surface.

This section needs additional citations for verification. peregrinum) – Russian comfrey, healing herb, blackwort, bruisewort, wallwort, gum plant Symphytum grandiflorum – creeping comfrey.Symphytum caucasicum – Caucasian comfrey.Symphytum brachycalyx - Palestine comfrey.Symphytum asperum – prickly comfrey, rough comfrey.

They are not to be confused with Andersonglossum virginianum, known as wild comfrey, another member of the borage family. × uplandicum, are used in gardening and herbal medicine. officinale, Symphytum grandiflorum, and S. Some species and hybrids, particularly S. Symphytum is a genus of flowering plants in the borage family, Boraginaceae, known by the common name comfrey (pronounced / ˈ k ʌ m f r i/).
