I have rented a heated greenhouse plot at Waterford Oaks. I will have use of it from 13-Sept through 13-April. My question is, what kind of veggies can I grow in that environment? I'm thinking that the very short winter days will affect flowering plants like cucumbers or melons or tomatoes. Am I limited to leaf veggies like lettuce and spinach? I've searched the web, but it all seems to be about unheated hoop houses.