Glandora diffusa (Lag.) D.C. Thomas

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purple gromwell

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purple gromwell visionspictures.com
purple gromwell visionspictures.com
purple gromwell visionspictures.com

Other common names

gentian gromwell

Synonyms

Lithospermum diffusum
Lithodora diffusa

Shrubs Alpine Rockery
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A prostrate, evergreen shrub with branching stems forming a low, spreading mat clothed in narrow, hairy leaves to 2.5cm long. Small, intense blue, funnel-shaped flowers to 1cm wide are borne just above the foliage from late spring into summer

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
5–10 years
Max Spread
0.5-1 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam Sand
Moisture
Well–drained
pH
Acid or Neutral

Position

Full sun
Aspect
East–facing or South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Boraginaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Matforming
Genus
A genus of flowering, evergreen, shrubby plants from borage family. They are cultivated for their five-lobed, funnel-shaped, blue or white flowers produced in cymes in summer. Leaves are linear, lance-shaped or elliptic, densely hairy
Name Status
Correct

How to Grow

Cultivation

Grow in well-drained, acidic to neutral soil in full sun

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Gravel garden
  • Patio and container plants
  • Rock garden
  • Mediterranean climate plants
  • Low Maintenance
  • Banks and slopes
  • Garden edging

Pruning

Pruning group 8

Pests

Generally pest-free

Diseases

Generally disease-free