Sorbaria sorbifolia 'Sem' Plant 3Ltr PotSorbaria sorbifolia 'Sem' (known also as the 'Tree Spiraea') has a large number of upright and reaching stems that carry bronze coloured foliage in the spring which slowly matures into a vivid green before reddening in the autumn. It has a short summer flowering period that produces erect panicles of tiny flowers resulting in a frothy appearance. Key Features Young bronze foliage moving to a yellow green spring foliage Shrub Eventual Size: 2m