Wood rots, plastic boards are, well, plastic and they don’t stand up to UV, railroad ties are out due to creosote, cement blocks are heavy and unsightly, and pressure treated wood is suspect for vegetable growing.  The best materials for garden beds are attractive, durable, and non-toxic.  Most of the available planter beds are not that attractive-simply a wood or plastic box. Durable GreenBeds are healthy, durable, and beautiful. One of the best features is the breath-ability of our panels.  This brings oxygen to the root zone which greatly benefits healthy plant development.