Bridalwreath Spirea Spiraea prunifolia Height:  6 feetSpread:  6 feetSunlight:  full sun An heirloom shrub which is smothered in double white flowers along the wiry branches in early spring, looks like a ball of snow, and good fall color; a rather shrubby growth habit, with upright stems, quite leggy, needs underplanting and regular pruning.