Ground covers are versatile, spreading plants favored as a simple and attractive way to link ornamental plants, fill empty space and replace thirsty turfgrass. Some do a beautiful job of replacing lawns, making yard maintenance easier. Blue-flowering ground cover coordinates well with plants bearing orange or yellow flowers, for an eye-catching look, or deep-purple flowers, to create a monochromatic color scheme. Some of these flowering plants tolerate high levels of foot traffic, while others perish underfoot.
Blue star creeper (Isotoma fluviatilis) and mountain bluets (Houstonia caerulea "Millard’s Variety") work well around and between pavers and flagstones. Expect a carpet of flowers all summer and into fall when you plant blue star creeper in U.S. Department of Agriculture plant hardiness zones 6 through 9. This sturdy evergreen tolerates high foot-traffic and can serve as a lawn substitute. “Millard’s Variety” puts out blossoms from mid-spring into early summer and easily grows in acidic soil in USDA zones 3 through 9. Tolerant of light foot traffic, it prefers moist to wet soil.
Blue periwinkle (Vincor minor) and Turkish speedwell (Veronica liwanensis) are evergreens that display bright-blue blossoms from spring into early summer in USDA zones 3 through 9. Blue periwinkle enlivens places in full to partial shade, and it tolerates moderate foot traffic. It performs best when mowed every couple of years. Turkish speedwell resists drought, makes a good lawn substitute and looks lovely paired with spring bulbs. This ground cover tolerates light foot traffic. Both blue-flowering ground covers are a nice addition to rock gardens and tolerate drought and the nibbling of deer and rabbits.
Dalmation bellflower (Campanula portenschlagiana “Miss Melanie”) and ground morning glory (Convolvulus sabatius) display violet-blue blossoms all summer and are naturals for rock gardens. The dwarf species, “Miss Melanie,” tolerates light foot traffic and pairs nicely with shrub roses (Rosa spp.). This vigorous and floriferous plant is a wonderful choice for small, contained garden beds in USDA zones 5 through 9. A hot, sunny area in USDA zones 7 through 9 is an idyllic spot for ground morning glory. This drought-tolerant ground cover turns out eye-catching, funnel-shape flowers.
“Big Blue” lilyturf (Liriope muscari “Big Blue”) and carpet bugle (Ajuga reptans “Black Scallop”) beget spikes of deep-blue flowers and grow in full shade to full sun. At a height of 8 to 20 inches, “Big Blue” is taller than the typical groundcover, but this grass-like plant is quite fashionable in the South. The evergreen thrives in USDA zones 6 through 9, and it has a high tolerance for heat and humidity. "Big Blue" displays flowers from midsummer into early fall. Carpet bugle, also known as bugleweed, offers glossy, purple-black, scallop-shape foliage, and it flowers from mid-spring into early summer in USDA zones 3 through 9. True to its name, carpet bugle tolerates light foot traffic.