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Sparkling white candytuft, with its cool evergreen foliage, brightens any rock garden or wall for several weeks in spring. At bloom time, plants are covered with umbels of pure white flowers that fade to pink. Compact selections are now available. Where happy, this plant will spread. Supply good drainage, and cut back spent flowers to keep plants neat.
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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.
Basket-of-gold is one of those plants that loves to grow in the least likely of place -- cracks between paving stones, the edge of gravel paths and patios, rocky outcroppings, between the stacked stones of a retaining wall, and more. It loves a baked spot with excellent drainage but will struggle in hot, humid areas and tends not to do well in the South.But where it does well, it's a showstopper. It will reseed prolifically in little cracks, filling an area each spring with dazzling neon yellows. After it finishes blooming, the grayish-green foliage makes an attractive mat in the perennial garden.
Easy and undemanding, veronicas catch the eye in sunny gardens over many months. Some have mats with loose clusters of saucer-shaped flowers, while others group their star or tubular flowers into erect tight spikes. A few veronicas bring elusive blue to the garden, but more often the flowers are purplish or violet blue, rosy pink, or white. Provide full sun and average well-drained soil. Regular deadheading extends bloom time.