Planting Black Knight Butterfly Bush. Planting Growing Black Knight Butterfly Bush will grow to be about 5 feet tall at maturity with a spread of 5 feet. Be sure to plant your butterfly bush so the crown is just above the soil level once you water at the base.
Partial to full sun is recommended for best results. Black Knight Butterfly Bush gets dark purpl. You will be separating this from the mother plant by tracing it down to the roots.
10 to 15 feet.
Each dark purple to black bloom gets about 4-10 inches long. 10 to 15 feet. This fast grower needs regular watering and grows extremely fast in the spring. Butterfly bushes sometimes called summer lilacs are recommended for USDA hardiness Zones 5 to 10 and need full sun and fertile well-drained soil.
