A trailing evergreen perennial with narrow, dark green leaves and clusters of long-lasting azure-blue flowers. Photo provided by: Ball Colegrave...

A beautiful variety with fuzzy mid green foliage and short upright stems topped with clusters of large coral-pink semi double flowers. Photo provided by: New World Plants...

A fantastic ground cover perennial with masses of medium white eyed royal blue flowers on top of dense and fast spreading green foliage that has a silver sheen. Photo provided by: All Plants B.V....

A clump-forming perennial with narrow grass-like, arching leaves and strong bronze spikes topped with bold bright yellow flowers. Photo provided by: Just Must Perennials...

An unusual variety with mounds striking green and cream variegated leaves and slender upright spires of tiny white flowers. Photo provided by: Eagle Plants Ltd...