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Lithodora ‘Crystal Blue’ (Gromwell)

Gromwell 'Crystal Blue'

Lithodora Crystal Blue, Gromwell 'Crystal Blue', Purple Gromwell 'Crystal Blue', Evergreen Shrubs, Blue Flowers
Lithodora Crystal Blue, Gromwell 'Crystal Blue', Purple Gromwell 'Crystal Blue', Evergreen Shrubs, Blue Flowers

Noted for its large flowers, Lithodora ‘Crystal Blue’ (Gromwell) is a vigorous, low-growing, evergreen shrub forming a mat of small, lance-shaped, dark green, hairy leaves. In spring and summer, the shrub is literally covered with abundant, sky-blue flowers, the largest of the genus. Compact and easy to grow, this plant is ideal for rock gardens, slopes, and cascading over retaining walls. A choice groundcover making an unforgettable display week after week.

  • Grows up to 4-6 in. tall (10-15 cm) and 24-30 in. wide (60-75 cm).
  • Easily grown in acidic, well-drained soils in full sun or partial shade. Full sun is best in cool summer climates, but some afternoon shade is appreciated in hot summer climates.
  • Deer resistant and drought tolerant.
  • Great for beds and borders, slopes, as a groundcover, cottage gardens, coastal gardens, city gardens, Mediterranean gardens, or gravel and rock gardens. Good choice for containers too.
  • Virtually disease and pest free
  • Prune lightly in late summer by trimming the new tip shoots back by about half, to encourage a dense habit. Propagate by semi-hardwood cuttings
  • Native to Southern and Western Europe.

Requirements

Hardiness 6 - 9
Heat Zones 6 - 8
Climate Zones 5, 6, 7, 14, 15, 16, 17
Plant Type Shrubs
Plant Family Boraginaceae
Genus Lithodora
Exposure Full Sun, Partial Sun
Season of Interest Spring (Mid, Late)
Summer (Early)
Height 4" - 6"
(10cm - 15cm)
Spread 2' - 3'
(60cm - 90cm)
Spacing 30" (80cm)
Maintenance Low
Water Needs Average
Soil Type Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Tolerance Drought, Deer
Attracts Butterflies
Garden Uses Banks And Slopes, Beds And Borders, Ground Covers, Patio And Containers
Garden Styles Coastal Garden, City and Courtyard, Mediterranean Garden, Informal and Cottage, Gravel and Rock Garden
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Alternative Plants to Consider

Lithodora diffusa ‘Grace Ward’ (Gromwell)
Lithodora diffusa ‘Gold ‘n Sapphires’ (Gromwell)
Lithodora diffusa ‘White Star’ (Gromwell)

Recommended Companion Plants

Heath and Heather

Find In One of Our Guides or Gardens

Stunning Blue Flowers to Enhance Your Garden’s Beauty
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.
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Requirements

Hardiness 6 - 9
Heat Zones 6 - 8
Climate Zones 5, 6, 7, 14, 15, 16, 17
Plant Type Shrubs
Plant Family Boraginaceae
Genus Lithodora
Exposure Full Sun, Partial Sun
Season of Interest Spring (Mid, Late)
Summer (Early)
Height 4" - 6"
(10cm - 15cm)
Spread 2' - 3'
(60cm - 90cm)
Spacing 30" (80cm)
Maintenance Low
Water Needs Average
Soil Type Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Well-Drained
Characteristics Showy, Evergreen
Tolerance Drought, Deer
Attracts Butterflies
Garden Uses Banks And Slopes, Beds And Borders, Ground Covers, Patio And Containers
Garden Styles Coastal Garden, City and Courtyard, Mediterranean Garden, Informal and Cottage, Gravel and Rock Garden
How Many Plants
Do I Need?
Not sure which Lithodora (Gromwell) to pick?
Compare Now

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