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Buddleias - Black Knight

Scientific Name: Buddleia davidii
Best Planted In Zone: 5-9


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  • Care
The Black Knight, also known as the butterfly bush (as its sister plant is, the Nanho Blue ) is a herbaceous perennial showcasing deep, purple blooms (almost black) that make excellent fresh-cut arrangements. Bloom time is from June to September. These deciduous shrubs thrive in full sunlight and fertilized soils with regular watering. Their willowy, gray-green foliage and spike-like terminal clusters are a welcome addition to any garden, and unlike many other flowering bushes, their blooming cycle spans from spring until fall's first frost. At maturity, it can reach a height between 6 to 8 feet and a width of 3 to 5 feet. USDA ZONES: Zone 5, Zone 6, Zone 7, Zone 8, Zone 9.
Most PlantMeGreen trees can be shipped and planted any time of year, unless the variety is specified as only seasonal delivery. Packages are typically shipped within 7-10 days from the time of your order. You will receive a tracking email upon confirmation of your PlantMeGreen purchase. On some occasions, severe weather and other unusual issues can delay shipping and delivery of your PlantMeGreen package. Delivery time cannot be guaranteed, if a package needs to arrive prior to a specific date, or at a more convenient time for you, please notate that upon placement of your order.
Buddleia ‘Butterfly Bush’ plants should be planted in fertile, well drained soil that receives full sun to light shade. It is best to plant them in spring or fall. When planting more than one, you need to plant them about six feet apart. Buddleias can be considered an invasive species. Therefore, you'll want to maintain the plant so that it doesn't produce new seedlings in unwanted locations. After you have selected the site, prepare the bed by tilling the soil to a depth of 12”, mixing in a combination of peat moss and compost. Then dig the hole about twice as large as the root ball. Set the plant in the hole so that the top of the root ball is even with the soil. Carefully replace the soil and firm the soil. Water the plant thoroughly before applying a light layer of mulch.
Grows best in soils with a pH of 6.5 to 7 (alkaline) plus a slow release fertilizer in the summer; full sunlight is required to produce a viable plant, and average or better drainage is needed. Cutting back the plant in late winter facilitates the most vibrant spring growth --in hardiness zones 5 and 6 the plant will probably die in the winter, which is ok; cutting back the plant to the ground in the other hardiness zones will produce the best results next season, and the removal of spent flower spikes during the season will help produce even more blooms (one additional note: Always leave at least one bloom intact on the plant until late winter or when it dies off for the season).

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