No matter where you grow your grape vines, you will need to put up some sort of support system.
Against a wall or in a glasshouse: Use 2-3mm diameter galvanised wires stretched horizontally along the wall or between the glazing bars of the glasshouse. Space them 30cm (1ft) apart. Thread the wires through ’vine eyes’ which are made specifically for this purpose and can be bought to screw into wood or masonry, or to clip into the aluminium glazing bars of the glasshouse.
In open ground: Construct a post and wire support using 2m (6½ft) x 10cm (4in) pressure-treated timber posts driven 45cm (18in) into the ground and positioned 4-4.5m (13-15ft) apart. Stretch 2-3mm diameter galvanised wire between the posts, fixing the wires to the posts with screw-in vine eyes. Attach the first two wires 40cm (16in) and 55cm (22in) above ground level. Subsequent wires should be double, secured on each side of the posts, and at 30cm (1ft) intervals from the lower wires.