Frilly pom pom style flowers makes clematis 39vyvyan pennell39 one of the more unusual cultivars of clematis its lavender blue double flowers about 6 to 8 inches in diameter emerge in late may later in the year the clematis will flower again but this time it will have single mauve flowers that look more like a typical clematis bloom it has rich dark green foliage and is a good climbing plant to cover untidy or old fencing or a drab wall in a sunny position height 3m 401039