'Black Knight' Butterfly Bush 3 Gallon Potted Shrub Rodent Away Remove from package and wind Acadie Hydrolyzed Fish Fertilizer Remove from package and wind the turning knob – usually a minimum of 10 clicks this variety offers a crisp and delightful taste This flowering butterfly bush plant features very dark purple conical flower heads that have a bloom time from early to mid summer to early fall at their prime As long as you have a sunny planting spot this flowering perennial shrub will flourish with big purple flower heads whose fragrance will attract butterflies and other pollinators like bees or hummingbirds to your landscape