We are fortunate to work with some of the industry leaders in their sector of the market such Greenscreen a Modular Trellising System.    If you love our planters and are looking to add a trellis system to your design, check out the G.S.planter with trellis section as we have custom reinforcements built-in to incorporate their trellis:

http://greenscreen.com/projects/photo-gallery/planters-with-trellis/#