Lithodora diffusa (Lithodora)

Plant Profile

Lithodora diffusa is a low, spreading, evergreen sub-shrub prized for its intense, true blue, funnel-shaped flowers that cover the plant in spring, often with a second flush in summer. The narrow, dark green leaves are bristly. It forms a dense mat. Requires excellent drainage.

Key Characteristics

• Family: Boraginaceae
• Genus: Lithodora (lith-oh-DOR-uh)
• Species: diffusa (dy-FEW-sa)

Growing Conditions

Full sun to part shade, extremely well-drained, gritty, acidic soil. Hardy in USDA zones 6–8. Dislikes wet feet and alkaline soil.

Landscape Uses

Rock gardens, slopes, walls, containers. Stunning blue flowers.

Maintenance

Mulch with gravel. Avoid overwatering. Prune lightly after flowering.