Black Knight Butterfly Bush

About this plant

Buddleja davidii 'Black Knight' is a truly exceptional deciduous shrub renowned for its spectacular floral display. Throughout summer, it produces abundant, slender panicles of intensely dark purple flowers, creating a dramatic contrast against its silvery-green foliage. The intoxicating honey-like fragrance wafts through the garden, making it a delightful addition to borders, cottage gardens, or as a vibrant specimen plant. Beyond its undeniable beauty, 'Black Knight' is a champion for pollinators. Butterflies of all shapes and sizes, along with bees and hummingbirds, are drawn to its nectar-rich blossoms, transforming your garden into a buzzing, fluttering haven. Its robust growth habit and long blooming period ensure months of enjoyment. This cultivar is a popular choice for its rich color and reliable performance. A relatively low-maintenance shrub, it provides significant visual impact and ecological benefit with minimal effort, making it ideal for both experienced gardeners and those just starting their horticultural journey.

Installation timing

When we're in season, outside of the winter months, our goal is to get your plants installed within about two weeks. That window gives us enough time to secure your plants from our supplier and find a spot on the schedule. Throughout the process we stay in touch through notifications and your existing client portal on the main A Cut Above website, which is separate from this landscaping plants shop.

Care & maintenance

Requires minimal pruning to maintain shape; cut back in late winter/early spring to encourage vigorous new growth and abundant blooms.

Watering suggestions

Proper watering is the single most important factor in your plant's survival after installation. Newly installed plants have a limited root system and rely on you for consistent moisture while they establish.

• First 2 weeks: Water deeply every day (or every other day in cooler, wet weather), soaking the root ball and surrounding soil.
• Weeks 3–12: Water deeply 2–3 times per week, adjusting for rain, heat, and soil drainage.
• After establishment: Water deeply about once a week during the growing season, and more often in extreme heat or drought.
• How to check: Stick a finger 2–3 inches into the soil near the roots — if it's dry, it's time to water. Deep, less-frequent watering encourages strong roots; shallow daily sprinkles do not.
• Avoid: Overwatering (soggy, waterlogged soil) is just as harmful as underwatering and can drown roots.

Watering needs vary by plant, season, soil, and exposure. Because proper watering is the customer's responsibility after installation, please make sure you understand and can follow these suggestions before ordering.

Good to know: plants and trees purchased from and installed by A Cut Above include a one-year limited warranty from the date of installation. Because plant survival depends heavily on proper watering and care after installation, losses caused by improper care, neglect, animal or chemical damage, or extreme weather are not covered, and we must be given the chance to inspect a struggling plant before it's removed or replaced. Coverage is one replacement per plant. Read our warranty info.