Autumn White Clematis (aka. Sweet Autumn, Sweet White) A profusion of fragrant, attractive blooms. Plants grow fast. Vines get lengthy, so need trellising or other support. Winter-hardy in Pa. -- the plant spreads by seed and is slightly invasive, but easily uprooted or cut down where it is not wanted. All sorts of bees flock to the flowers in droves. Hummingbirds browse it, possibly for bugs more than nectar.