'Black Knight' Butterfly Bush 3 Gallon Potted Shrub Rodent Away Improves new shoot development in Pest Trap Improves new shoot development in shrubs and perennials Grow healthier plants cultivating allows moisture and air to get below the packed soil 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