MEANS OF SUPPORT In practical terms climbers and wall shrubs may be divided into two broad sections: climbers which adhere to walls by means of aerial roots or by tendrils tipped with adhesive discs, and climbers which climb by means of twining stems, curling leaf stalks or curling tendrils. Examples of climbers with aerial roots include the ivies (hederas) and the climbing hydrangea, Hydrangea petiolaris. An example of a climber with tendrils tipped with adhesive discs is Virginia creeper, Parthenocissus auincjuefolia. Once established and growing strongly, these climbers should be completely self-supporting. They often, however, require some assistance to induce their tendrils or aerial roots to adhere to the wall or climbing surface. In the case of newly planted young climbers of this type, lead-headed wall nails (as used to secure telephone cables) are useful to press stems against the climbing surface until the aerial roots or adhesive discs take over. A tall, large wall of rough-textured finish not requiring further decoration is preferable for these plants. Ivies and similar climbers, if they are removed at a later date, can loosen mortar or pointing of old brick walls or similar surfaces. Climbers which climb by means of twining stems include wisterias and honeysuckles; those with curling leaf stalks, clematises, and those with curling tendrils, the vines or vitises. These are not self-clinging and they require support, as do all climbing roses and wall shrubs. Most will require careful training and securing to galvanized wire (12 gauge is best) supported by vine eyes in the case of larger areas of wall or fence. In smaller wall areas, it is better to use plastic mesh trellis in green, brown or white secured to suitable battens. This method is particularly useful for restricted areas between windows, etc. Decoration of the wall or fence is possible in both cases. Vine eyes 3 or 4in(8 to 10cm) long are pointed strips of galvanized metal with a hole at the broad end through which the wire is drawn. They should be driven into the wall, preferably at joints (sometimes it is necessary to use an electric drill in advance) at about 3ft(im) intervals in ranks either up or down and about 1 to i|ft(30 to 45cm) apart. Screw-in type vine eyes are available for fences, pergola posts, etc. PERGOLAS AND RUSTIC TRIPODS Pergolas constructed of brick, stone or wooden uprights and wooden cross-members often span a r3ath and makes a feature in many gardens. Climbers such as wisterias and vines and strong-growing honeysuckles and clematis are ideal for furnishing roof beams while less vigorous climbers or shrubs are secured to the uprights (say Clematis macropetala, Ceanothus 'Gloire de Versailles' or Actinidia kolo-mikta).In shrub and herbaceous borders an occasional rustic tripod will provide I support for climbing roses, clematis, jasmine or the bright yellow leaves ol I the golden hop, Humulus lupulus 'Aureus'.