Clematis montana 'Grandiflora' has a profusion of small cross shaped white flowers in late spring and early summer and it has dense deep grey-green foliage that can create a 'living wall' effect. This clematis can cover a whole fence, side of garage etc, and can also be planted to tumble over a garden front wall. It does best in a sheltered sunny position. Height: 12m (39'). Spread: 4m (13'). Pruning group: 1.