Well, it can be done, but I'm not sure how practical it is. I planted fava bean seed in October, nursed them through our mild southern Arkansas winter, occasionally wrapped in plastic and occasionally supported by a heat lamp during cold snaps. I just ate a delicious plate of new beans raw with a little olive oil and salt. But, let's face it, it took six months of pampering! The blossoms are very pretty; I'd never grown this plant before. But they did go through a good many below freezing nights.