Definitely use Catmint on a slope in your landscape design. Repeat it for splashes of color, repetition and so your eye follows the beautiful plant throughout the garden. It's low maintenance and drought tolerant too along with flowering almost all summer.
Ornamental Grass Garden Plan; This is one of the very low maintenance preplanned perennial gardens with drought tolerant ornamental grasses. It's fits a space about 6 feet wide and 6 feet deep. Plant in very well drained soil, and in full sun. Zones 4-9.