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Use for: larkspur

• A genus of herbaceous plants in the buttercup family (Ranunculaceae), many of which are grown for the floral industry and as ornamentals for their showy flower stalks.

• a genus of boreal dwarf evergreen plants with small crowded coriaceous leaves and flowers on short peduncles

• a family of chiefly north temperate low evergreen plants having pentamerous flowers and epipetalous stamens and the ovary trilocular

Use for: yams

• A genus of mostly tropical twining herbs (family Dioscoreaceae) including the yams and having net-veined leaves and small dioecious flowers

• The yam family. Plants are herbaceous or woody vines and shrubs, distributed throughout tropical and warm temperate regions. Members of the family have thick, sometimes woody roots or tuber-like underground stems and net-veined, often heart-shaped leaves that sometimes are lobed. The small green or white flowers of most species are borne in clusters in the leaf axils. The fruit is a winged capsule or a berry.

Use for: dragonhead

• A genus of plants in the Lamiaceae family. Native to temperate Eurasia, with the exception of one species, the American dragonhead (Dracocephalum parviflorum), which is native to North America. Several species are grown as ornamentals for their attractive flowers.

Use for: Elm blight

• A widespread fungoid killer of elms (Ulmus species) and certain other trees, first described in the Netherlands. Spread by bark beetles, the disease has decimated elm populations throughout much of Europe and North America.

• Natural dyes. Colours extracted from plants.