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Lithodora diffusa ‘Star’ (photo courtesy of Linda Lamb Peters)
Lithodora diffusa ‘Star’ (photo courtesy of Linda Lamb Peters)

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Zone
Zones 5-7, 14-17
Full SunPartial Sun
Full, Partial
Regular Water
Moderate

Lithodora diffusa

Boraginaceae
Ground covers, Perennials, Flowers

Probably the most recognizable blue-flowered groundcover in its range, Lithodora forms a prostrate, somewhat woody, slightly mounded mass to 6–12 in. high and 3–4 ft. wide. Narrow evergreen leaves are 3/4–1 in. long; both foliage and stems are hairy. In late spring (and often later), the plant is sprinkled with brilliant blue, tubular, 1/2-in.-long flowers. Native to southern and western Europe.

Give loose, well-drained, lime-free soil. Best suited to mild-summer climates. ‘Heavenly Blue’ and ‘Grace Ward’ are the forms most commonly seen. ‘Star’ (‘Blue Star’) has white-edged blue blossoms.

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