This is my center trellis; it has two steel vertical posts which are plastic coated. I think I will add a third posts; the tops each have a pvc saddle so they are attached to the main rib running down the center. I then clamped the center spine to the top of each door frame. My goal is to give the hole thing strength so the winter snow does not collapse the greenhouse. The overall curve tends to help the snow slide down but sometimes I had to use a push broom to move it along when it seemed to be weighing it down.
The far left bed has an armenian cucumber, tomatillos, 2 yellow pear tomatoes, celery, leeks, and a few pepper plants. It is ready for some radish, spinach, and lettuce to fill in the bare spots. It is also time for a few scoops of compost as well.
There are 4 upside down planters down the center; they each contain different cherry tomatoes. I find these tend to fair better in the hanging baskets and I do not seem to loose any productivity or fruit size. Now that the tomatoes are established I can add sugar snap peas into the tops. I filled each pot with a lightweight potting mix so center bar would not be weighed down too much when I watered them.
My next challenge and goal is to set up an irrigation system inside the greenhouse.