Believed to be native to Africa, Hyacinth pods turn dark green on the outside when mature, whereas their interior beans will take on a darker green hue. It is worth noting that immature Hyacinth beans are edible, though they may not taste as good as most other beans. However, they contain iron, magnesium, zinc, phosphorous, copper and thiamin. It is worth noting that these beans can be toxic if they're not cooked properly - Something you need to keep in mind if you decided to give them a try.