Clematis Avalanche ? Clematis plant Blooming from March until May this deciduous Clematis will brighten up your garden from early Spring. It spreads to around 100cm and grows to a great height of 250cm! Perfect for developing up an obelisk, try training this beauty along a fence, wire, or structure for a fantastic focal point to your outdoor space. Clematis certmanii ?Avalanche? produces some of the largest blooms of the evergreen Clematis variety, contrasting well with its non-clinging glossy green foliage. Clematis Avalanche has a scrambling habit and is ideal for floating through sunny borders and adding some elegance throughout other well-established shrubs.