I left a couple of tubers in the ground to see if they would over-winter, but I took most out and will keep some for planting in the spring when the soil warms up. In total the two plants I grew (each from a single tuber) both yielded a similar amount totalling 4.245kg. Not bad for a an easy to grow climber with attractive edible leaves.
I also harvested the two Jerusalem artichoke (Helianthus tuberosus) plants at the same time. They were also really productive. I filled a great big bucket with their tubers weighing in at 6.205kg!