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Phlox subulata 'Emerald Cushion Blue' (Alpine phlox 'Emerald Cushion Blue')

Other names: Moss phlox 'Emerald Cushion Blue', Creeping phlox 'Emerald Cushion Blue', Phlox subulata 'Emerald Blue', Phlox subulata 'Blue Emerald'

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Variety or Cultivar
'Emerald Cushion Blue' is a dense, vigorous, mound-forming, evergreen perennial with linear, dark green leaves and salverform, lavender-blue flowers in late spring and early summer.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
0.15 m 0.6 m 5-10 years
0 ft 2 ft 5-10 years

Where to grow

Soil type
  • Chalky
  • Loamy
  • Sandy
Soil drainage
  • Well-drained
Soil pH
  • Acid
  • Alkaline
  • Neutral
Sunlight
  • Partial Shade
  • Full Sun
Aspect
  • East
  • West
  • South
Exposure
  • Exposed
  • Sheltered

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Additional plant details

Cultivation

Plant in fertile, free-draining soil in full sun or, in low rainfall areas, in dappled shade.

Suggested uses

Gravel, Ground Cover, Rock, Beds and borders, Mediterranean, Cottage/Informal, Drought Tolerant, Edging, Low Maintenance, Underplanting, Garden edging

UK hardiness

H6

USDA zones

Zone 3, Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

Sunset zone

4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 1, 2, 3

WUCOLS

North-Central Coastal = Moderate/Medium
Central Valley = Moderate/Medium
South Coastal = Inappropriate
South Inland = Inappropriate
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Evergreen

Habit

Mat-forming, Compact, Dense

Native to

Garden origin

Drought tolerant

Yes

Flood tolerant

No

Toxicity

Not toxic

Plant care

Pruning

Deadheading will prolong flowering. Divide every 3-4 years in autumn.

Propagation methods

Division, Softwood cuttings

Pests

Eelworms (leaf and bud)

Eelworm (stem and bulb)

Diseases

Powdery mildew

Leaf spot

Divide and replant clumps in autumn or early spring

Plant container grown plants in deep fertile, well-drained soil

Take softwood cuttings

Divide and replant in spring

Plant container grown plants in a sunny postion

Cut back after flowering

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Phlox

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Phlox paniculata 'Hampton Court'
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Phlox paniculata 'Le Mahdi'
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Phlox paniculata 'Prospero'
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Phlox paniculata 'Sir John Falstaff'
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Phlox paniculata 'Sandringham'
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Phlox paniculata 'Blue Ice'
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Phlox paniculata 'Look Again'
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Companion plants (0)

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