Plant Six Hills Giant Catmint in well-drained soil with full sun exposure to encourage robust growth and abundant flowering. Water regularly during the first growing season to establish a deep, extensive root system, then reduce frequency as the plant becomes drought-tolerant. Prune back after the first bloom to promote a second flush of flowers and maintain a tidy appearance. Divide clumps every few years in early spring to rejuvenate the plant and prevent overcrowding.