Purple Gromwell Heavenly Blue

A lovely plant for ground cover or the rock garden, Lithodora diffusa Heavenly Blue is an evergreen perennial with a prostrate, creeping, mat-forming habit. The small, hairy, grey-green leaves make a perfect foil for the intensely deep blue, star-shaped flowers, which are 12mm across and are borne from late spring to late summer. To encourage a dense, ground-covering habit, trim the current years growth by about half after flowering. Purple gromwell Heavenly Blue holds the RHS Award of Garden Merit.

Site: Tolerates exposure
Soil: Well drained, light, acid to neutral soil
Position: Full sun or partial shade
Season of interest: Late spring to late summer
Hardiness: Fully hardy
Height: 15 (60cm) Spread: up to 18 (45cm)