Crazy Hyacinth Bean Vine

This vine is reaching out its tentacles with a view to world domination. If you check my archives you might see the bare, 10-12 foot tuteur teepee thingy I built a few months back. 2 Hyacinth bean plants have totally swamped it and are spreading toward the beans and the potatoes. So much for the "Death Square."

Speaking of potatoes I dug some today and found 11 from one plant! My usual yield from one plant is about 6. I wonder how long you can leave them in the ground once the vine withers? I'd hate to have to dig them all at once -- they'd go bad for sure.