Clematis cartmanii 39early sensation39 is a delightful climber that flowers early in the year when there are few other blooms to be found in the garden the flower buds drip from this compact hardy climber before opening into upturned white flowers which have pale apple45green bases and yellow45green stamens the evergreen waxy foliage provides good contrast to its white flowers which appear from february to april they later form attractive seedheads which can last throughout the