Clethra alnifolia ' Hummingbird' known in the United States as the sweet pepper bush is a compact, upright, deciduous shrub with shiny dark green foliage which turns a striking yellow in autumn & upright spikes of extremely fragrant white flowers. The flowers appear on the current years growth mid to late summer. RHS Award of Garden Merit winner. Flowers July-August. Height 100-150cm. Supplied in a 7.5-10 litre pot.