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Pale lavender-blue flowers deepen to purple toward a yellow eye, blooming indomitably throughout the summer on this 18" x 18" shrublet. There really are few plants that bloom this much, this long! Cut back hard in early spring to thicken it, but not into the stem's woody base. Place close to pathways to appreciate it's airy foliage and plentiful, persistent, floating flower cups.Minimum temperature: 0º F