A vigorous shrub with stunning deep blue blooms from July through frost. Easy to grow, reliable, and perfect for bold summer color in borders and foundation plantings.
The Basics
Zones 6–9 | 4–6 ft tall and wide | Deep blue flowers
Why You'll Love It
- Heavy blooms all summer long
- Large flower heads with real impact
- Low maintenance
- Acidic soil deepens blue tones
Growing Tips
Plant in well-draining soil and water during dry spells. Prune after flowering. For deeper blues: acidic soil (pH below 6.0) intensifies color; alkaline soil shifts toward pink.