Nescafe, Purple Jade Vine. Attractive legume with unusual royal purple flowers and seeds known as mucuna beans or Nescafe. Seeds and are used as a coffee substitute. Has been used for generations in India as a medicinal plant. Related to red Jade vine (Mucuna bennettii). The dark violet blooms appear closely pushed together in grape like clusters, up to 1 ft long and 6" in diameter. Very vigorous woody tree creeper - during warmer weather this vine can grow 2 feet or more a week!