The butterfly pea is a climbing perennial with striking blue flowers. It is used ornamentally and in traditional medicine. The flowers are sometimes used as a natural food coloring. Inputs Hardiness zone 61 Hardiness zone 71 Hardiness zone 81 Hardiness zone 91 Type Plant Vine1 Perennial Functions Nitrogen fixer2 Footnotes Clitoria mariana | Plants for a Future ↩ ↩2 ↩3 ↩4 ↩5 Gaia’s Garden - A Guide to Home-Scale Permaculture, 2nd Edition Table 6-3 ↩