Purple vetch (Vicia benghalensis) is a fast-growing annual or short-lived perennial herb grown as a nitrogen-fixing, weed-suppressing green manure, with a turquoise-green dye obtained from its flowers. Inputs Full sun1 Semi-shade1 Moist soil1 Outputs Dye1 Type Vicia spp. - Vetch Herb Annual Perennial Functions Nitrogen fixer1 Footnotes Vicia benghalensis | Plants for a Future ↩ ↩2 ↩3 ↩4 ↩5