Peas will thrive in a small plot when they are planted in a cocktail, and early. I put AWP in about 5 weeks ago with clover, rye, oats, beans and sunflower. Food plot size ranges from 20' wide shooting lanes to 1.5 acre plots. Some growth is 2' plus. My deer density is getting better, but I still have way too many deer.
I wouldn't ever plant a monculture of any pea. That is opening yourself up for plot failure. The later you plant them the less growth your gonna get, and opening yourself up for plot failure. This is my first time planting AWP in the spring, so I'm not exactly sure what they will look like come fall. At this point, they are looking really good, and it will be intersting to see if they go to seed and dry up by fall. If they don't, every one of my plots is going to be getting AWP planted in the spring.
I'm not sure exactly what planting rate I have them at, but I'd say I have a plant every 2', planted in 7" rows.