young leaves of dock, although somewhat bitter, were cooked as a
vegetable. Culpeper said that "all docks being boiled with meat, make it
boil the sooner", adding that they were "as wholesome a pot herb as any
growing in a garden."
The plant was listed by Aelfric. In country districts, the leaves were
used to wrap butter, hence the name 'butter-dock'. The roots of
broad-leaved dock yield a greenish-yellow dye.