Pugster® Amethyst butterfly bush - This compact butterfly bush reaches just 2' tall and wide but has the large, full flowers normally seen on a much larger plant. It blooms non-stop from early summer through frost with amethyst-toned flowers, each with a tiny yellow-orange eye in the center. Thanks to thick, sturdy stems, the Pugster® series offers vastly improved hardiness and winter survival over other types of dwarf butterfly bush. Zones 5a-9b