Are you sure it's a rambler you want, and not a climber? As David Austin's website explains, climbers are moderately vigorous, tend to have large blooms, and many are repeat-flowering. On the other hand, ramblers are much more vigorous and tend to produce great quantities of small flowers, but most do not repeat flower. (There are exceptions to both these rules.) Climbers are typically best for walls, trellises, and arches, whereas ramblers are generally better for growing into trees and covering pergolas or large structures such as garages or sheds.
