Growing soya beans / edamame

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Has anybody tried growing soya beans from seed? I was trying to buy some edamame recently but we don't have an oriental grocers nearby, so I thought I'd have a go at germinating some organic soy beans I had in the kitchen cupboard. This worked really well, and I now have several little plantlets around 8 inches high. I was just wondering what to expect - has anyone grown viable soya/edamame at home, around how long does it take, and what kind of cropping should I expect?