In spite of the 'tree' in its name, Chastetree is a decidous multi-stemmed shrub. It grows slowly to 10 to 15 feet tall and as wide; it is broad, so place accordingly. It has beautiful clusters of fragrant lilac or white flowers in summer which is striking against the gray green, slender, pointed leaves. Butterflies love this shrub. Thrives in heat.
Listed as being hardy to Zone 6 or 7 (Dirr), so plant in a location sheltered from cold winter winds; it may not be well suited for the bench areas, though I know of a few that are thriving up in those elevations. Requires full sun and well drained soil. In our winters, Chastetree may die to the ground; in milder winters, it may loose all its foliage but the branches may survive. Prune out any branches that did not survive the winter once the shrub has broken it's dormancy in the spring.