Blue Diddley® Vitex makes the plant even better with its dwarf stature that is about half the size of typical vitex. In the north, zones 5-6, this plant acts like a perennial and dies back to the ground, but regrows and flowers much like a butterfly bush (buddleia). It is slow to break bud in the spring, so do not panic if the plant looks dead, it will sprout new shoots and make a fine specimen in due time. It is a shrub or small tree in the south. This dwarf chastetree is a fun little ball of lavender-blue flower spikes in mid-summer. Its compact size fits nicely into perennial gardens and mixed borders.