Woadwaxen, also known as broom shrub, is a plant species that belongs to the legume family. It is a deciduous shrub that grows in sandy, rocky soils and can reach a height of up to 2 meters. The plant produces yellow flowers in the months of May and June and also has a sweet aromatic scent. Some synonyms for woadwaxen include Genista tinctoria, Dyer's greenwood, waxen woodwand, and dyer's broom. This plant species has been known for its use as a natural dye in ancient times, and it was particularly popular among the Celts who used it to dye textiles blue. Moreover, woadwaxen is also used in the production of various herbal medicines.