Category 2000 features our angled cable systems. The plants can be pulled upwards and then guided horizontally over to windows and doors. The vertical part of the support often serves only to guide the trunk of the plant (usually leafless)... a single cable is sufficient. Roses, vines, and clematis love and even need several parallel cables. Particularly strong twiners (like wisteria) thrive best on single cable systems (entanglement is thus avoided). Some plants, especially volubles, can be difficult to train horizontally (they require increased effort to stay in a horizontal position), in which case angled trellis systems are only partially suitable. Find out more under the sections on Climbing Plants and Planning.