Crinkled, elliptic to ovate, medium to dark green leaves grow to 7 inches long on decumbent stems but to only 2 inches long on flowering stems. Tubular, bell-like, creamy yellow to white flowers appear in drooping clusters.

There are other comfreys with yellow or cream flowers, or with stolons

With stolons. The only other stoloniferous comfrey keyed out in Stace (4th edn.) is S x hidcotense, a hybrid with S grandiflorum with blue or pink flowers. 

Photograph of whole plant, plus flowers; confirmation that plant is stoloniferous

Usually encountered as an escape from cultivation which establishes in waste places, verges etc. often close to habitation.

Flowering May and June.

Herbaceous perennial.

Occasional but widespread in England and Wales.

Uncommon in the wild in Leicestershire and Rutland. It was not recorded in the 1979 Flora survey of Leicestershire.