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Rock cress, as you can guess from the name, is one of those plants that like tough love -- give it a hot, dry crack between some stones somewhere and it will flourish. It can cover a stacked-stone wall or rocky outcropping with beautiful blue-purple flowers.
Purple rock cress usually has purple or blue flowers, but rock wall cress is more likely to bloom in white or pink. Both make attractive low mounds that look great at the edge of retaining wall where they get full sun and excellent drainage. Cut stems back after spring bloom to keep plants compact.
The brilliant gold blooms of basket-of-gold form at the same time as those of purple rock cress, making a stunning color combination. Both look great draping over a low wall.Dianthus
The bluish-green foliage and pink blooms of dianthus coordinate beautifully with purple rock cress.Sedum
Creeping sedum is a good partner for purple rock cress on a slope or rock wall. Both appreciate good drainage and soften harsh lines.