The 3000 category contains T-shaped climbing systems. The plants are thus drawn up and then guided horizontally over windows and doors, on both sides. The vertical area of the trellises is sometimes used only for the guidance of the stem, which often remains leafless... then only one rope/cable is needed there. Roses, grapevines and clematis love several parallel lines (of rope/cable), but climbers like wisteria rather require one-rope/cable systems to prevent entanglement. Some plants, particularly lurching types, come into the horizontal position only with increased effort; T-shaped systems are therefore only suitable in certain conditions. Learn more in the climbing plants and planning sections.