The Pugster Amethyst Butterfly Bush (Buddleja x 'SMNBDO'), often marketed as Pugster® Amethyst, is a compact and dwarf cultivar of butterfly bush. Butterfly bushes (Buddleja or Buddleia) are known for their fragrant flowers that attract butterflies and other pollinators. Here are some key features of the Pugster Amethyst Butterfly Bush:

1. Size: Pugster Amethyst is a compact and dwarf cultivar, reaching a height of about 2 feet with a similar spread. Its smaller size makes it suitable for smaller gardens, containers, or as a border plant.

2. Flowers: This cultivar is valued for its abundant, fragrant flower clusters. The flowers are typically a rich amethyst-purple color, giving the plant its name. The flower spikes are dense and appear throughout the summer, attracting butterflies and other pollinators.

3. Foliage: The foliage of Pugster Amethyst is typically green, providing a lush backdrop to the colorful flowers.

4. Sunlight Requirements: Butterfly bushes, including Pugster Amethyst, thrive in full sun. Adequate sunlight exposure ensures vigorous growth and abundant flowering.

5. Soil and Watering: These plants prefer well-draining soil and are relatively drought-tolerant once established. Regular watering is beneficial, especially during dry periods, to encourage healthy growth and flowering.

6. Hardiness: Pugster Amethyst is generally hardy and can tolerate a range of climates. It is suitable for USDA hardiness zones 5 to 9.

7. Continuous Blooming: One of the advantages of Pugster Amethyst is its ability to bloom continuously throughout the summer, providing a long season of colorful flowers.

8. Landscape Use: This butterfly bush cultivar is often used in landscapes for its compact size and attractive flowers. It works well in mixed borders, cottage gardens, and as a focal point in smaller spaces.

9. Low Maintenance: Pugster Amethyst is relatively low-maintenance. Pruning can be done in late winter or early spring to maintain the desired shape, but it is not as invasive or vigorous as some other butterfly bush varieties.

When planting Pugster Amethyst Butterfly Bush, it's essential to provide well-draining soil and ensure good air circulation around the plant. Regular deadheading (removing spent flowers) can encourage continuous blooming. As with any plant, local climate conditions and soil types should also be taken into account for successful cultivation.