Diy Vegetable Garden Trellis . Materials needed to build this pvc vegetable garden trellis: Make a trellis with branches. 46 Amazing Beautifull DIY Trellis For Your Small Garden from www.pinterest.com This structure is highly flexible, so its final size is up to you. 22 easy and cheap diy garden trellis ideas you should try 1.hexagonal honeycomb trellis. There are lots of ways to trellis vegetables.