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heirloomgal
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From what I've researched there are two types, wild and cultivated. It is the wild ones that are toxic, I imagine the cultivated ones have been bred away from that trait, the way lupini beans have been bred away from bitterness.Be careful; they're toxic raw or undercooked (actually, this is this is the first time I've heard of anyone trying to eat them; they're usually a curiosity ornamental.)
Oh, and it's a tropical vine/climber, so you'll need a greenhouse/indoor space with a LOT of room.
Sadly, I don't have plans to grow it, they'd never make it here. I posted the clip because I thought it was incredible how huge they can get and they don't even need to be planted in the ground. You just put one on top of the ground and it grows into a vine that produces these tubers, which most people say taste as good or better than potatoes.