Definitely one of the best blue flowers for the spring sun garden. A very showy plant for its size, this low-growing lithodora is a great ground cover and filler in rock gardens. Flowers only half an inch across are an exceptional intense blue. Blooms appear in abundance in spring, and then less frequently through summer. Leaves are reminiscent of rosemary, about an inch long and narrow. Plants thrive in full to part sun, in acidic, well-drained soil.