tomato Growing in Greenhouse. Growing tomatoes in growbags in a greenhouse or growhouse, from potting on to season end.he time necessary to grow greenhouse tomatoes is much greater on a per unit basis than any field vegetable crop. Lucky you – with a greenhouse, you don’t need to wait for the outdoor soil to warm to start your tomatoes. Shot with a Canon 5D MKIII – 1920×1080, 25 fps