turnips will grow in t he woods. im doing in right now. what i would suggest is cutting as many smaller trees as you can down. every little bit of light helps a lot. if you have a logging road, even better. also, rye grass will grow almost anywhere. its of minimal nutritional value but if you put it along the deer's travel route, they will browse their way along. brassica plants do ok with little sun, just remember to seed heavy because there's more of a chance of seeds not reaching maturity.