Category 2000 is comprised of our angled cable systems. The plants are thus pulled upwards and then guided horizontally over to windows and doors. The vertical area of the climbing field sometimes serves only to guide the trunk of the plant (which is usually without leaves)... in this case only one rope is needed. Roses, vines, and clematis love several parallel cables. One-line systems prevent entanglement. Some plants-- particularly strong twiners (like wisteria)- require single cable systems to prevent entanglement (require increased effort to stay in a horizontal position); angled trellis systems are then only partially suitable. Find out more in the Climbing Plants and Planning sections.