Seeds from Asparagus Bean, Yard long bean, Chinese Red Noodle bean or Vigna ungulculata . A Annual plant that is heat tolerant and grows vigorously. The bean will loose its red color when cooked. These beans are stringless, sweet and tender. This unusual purple red color of this yard long bean is familiar in southern China cuisine. Grown as you would any legume or bean seeds in spring when all threat of frost has past.