10 Seeds True Jicama Seeds, Pachyrhizus Erosus A. K. A , Climbing Yam Bean, Mexican Turnip Jicama is a vigorous, subtropical and tropical, climbing legume vine from South America. It has very pretty, big, blue pea flowers. Sadly the flowers should usually be removed as the bean pods and seeds are toxic, they also take a lot of vigour from the plant and reduce the harvest of tubers considerably. Let one plant go to seed for your next year's crop. Even though this plant is an herbaceous perennial, it is usually grown as an annual, because the root tuber, the perennial part, is also the bit harvested. Jicama can be propagated from a tuber or seed. The plants die back in winter in cool climates but the tubers will shoot again in spring. The root of jicama develops swellings the size of a large turnip, (up to 5 per plant) under the surface of the ground. Plant Height: Even though this vine can reach 2 - 6 m tall, it is usually pruned to 1 - 1.5 m as removing the flowers can double the yield of roots. In Mexico it is grown in fields and pruned with a machete.