Buddleia × 'Pugster® Amethyst' (butterfly bush) brings full-size, amethyst-toned flower spikes to a compact plant that fits small beds and containers. You will get dense blooms on sturdy stems, with nectar that draws butterflies and other pollinators through the warm season.
Plant it where it receives full sun for the strongest growth and best flowering, though it can handle light shade. Provide well-drained soil and moderate moisture while the plant establishes; once rooted, it is forgiving of short dry spells. Space it so air moves through the branches and the mound can widen naturally.
For easiest care, cut it back in late winter or very early spring to encourage fresh, flower-bearing shoots. Deadheading can extend the display, but this series is known for blooming freely through summer into fall. Expect a tidy, mounding habit around 22-24 inches tall with a similar spread, making it a great choice for borders, foundation plantings, and patio pots.
In colder areas within its range, add a simple mulch layer after the ground freezes to buffer winter swings, and avoid heavy late-season fertilizer. With sun, drainage, and an annual cutback, you can enjoy months of fragrant color in a compact footprint.