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Carpet of Color. In limited space, consider using a mix of leafy plants planted close together, such as false speria, masterwort, or Endres cranesbill. You will achieve the dense effect you want, but it will be more ornamental. Low-growing creeping Jenny and common bugle suppress weeds while also providing a colorful contrast to larger plants.
Sedum 'John Creech' A dense groundcover with very small, green leaves that keep their intense color even in full sun. Its tight, compact habit keeps the weeds from poking through. Clusters of pinkish-purple flowers are produced in midsummer. Low, spreading sedums form a solid mat of foliage which can be planted as a groundcover in sunny, dry areas. They are extremely drought tolerant and many are evergreen. These are terrific low-maintenance plants that always look their best.