Sainfoin (Onobrychis viciifolia) is a perennial nitrogen-fixing legume with a deep taproot, grown as forage and a soil-building cover crop on poor, dry, chalky, or alkaline soils. Inputs Hardiness zone 51 Hardiness zone 61 Hardiness zone 71 Hardiness zone 81 Hardiness zone 91 Type Perennial Functions Nitrogen fixer1 Soil stabilization1 Attracting bees1 Wildlife habitat1 Footnotes Onobrychis viciifolia | Plants for a Future ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9