Clematis montana 39grandiflora39 has a profusion of small cross shaped white flowers in late spring and early summer and it has dense deep grey45green foliage that can create a 39living wall39 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 40393941 spread 4m 40133941 pruning group 1