Our company just bought a green house that is 144' long and i need to know how much wide open space I need around it. We are going to place it in one of our large fields in the back part of our farm fairly close to the creek. We now have about 4 acres of different shrubs that have been in the grounds since april and may. My brother is a horticulturist and knows how the plantings work, But I need some info on how much tree thinning we will have to do to make sure the green house has all day long sunlight. We also are looking at different way to heat the greenhouse and the different cost involved. We are applying for some state and federal money to help pay for all the equipment and other cost. Since the farm used to be used to raise tobacco we can get money for changing it into a tree farm and greenhouse. Any help would be appreciated.