Category 2000 contains the angled/bent growing systems. The plants are thus grown up and then drawn (guided) horizontally over to windows and doors. The vertical area of the growing field sometimes serves only to guide the stem of the plant (which is usually without leaves)...then only one (line of) rope/cable is used there. Roses, grapevine, and clematis prefer several parallel wire ropes (cables). One line systems prevent entanglement. Some plants-- particularly wisteria - need increased effort to grow and stay in horizontal positions; angled trellis systems are then only partially suitable. Find out more in the Climbing Plants and Planning sections.