"One of the most beautiful and decorative coverings perennial garden is Lithodora diffusa Heavenly Blue. Mature plant height is 10-15 cm, and the small flowers are deep blue. Lithodora supports very well both sun and semiumbra and is ideal for creating a garden floral rug. Blooms in May-June."
blue Nigella, also called Love-In-A-Mist Lovely shades of blue with lacy, fern like leaves and stems. It develops a lantern-shaped seed pod that is used I dried arrangements or simply to reseed this coveted annual. I first saw these at Longwood Gardens(10 yrs. ago) where I saved a few seeds to plant in my garden!