Wizard
Fava Bean in the US

Right, sowing fava beans is pretty straightforward. You'll want to direct sow them after your last frost date, you know, when the weather's starting to warm up proper. For my friends in USDA Zone 3 or 4, that's usually April or May, Zone 5 gets going March to May, Zone 6 and 7 maybe a bit earlier in March or February, and you folks in warmer spots like Zone 9 or 10 can get them in even earlier, or even in the fall. Pop your seeds about 2 inches (5 cm) deep and give them 6 to 8 inches (15-20 cm) between each plant. If you're doing rows, leave about 18 to 24 inches (45-60 cm) between those. Some folks like to inoculate their seeds with nitrogen-fixing bacteria, which really does give them a boost, I reckon.

If you've started some of the varieties indoors or in a cold frame, you'll want to get them hardened off properly before they go into the ground. Just a week or two outside, gradually getting used to the elements, then plant them out after that last frost, keeping the same 6 to 8 inch (15-20 cm) spacing. Fava beans can get a bit tall, especially if it's windy on your plot, so a bit of support like some canes or netting can stop them from flopping over.