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Phlox subulata /flɔks/

Common name: Moss phlox · Creeping phlox · Moss pink · Mountain phlox

Phlox subulata is a low, mat-forming evergreen perennial native to eastern North America, from the Appalachians and the eastern United States into adjacent Canada. Its dense, moss-like carpets of narrow, awl-shaped leaves are blanketed in spring by masses of starry, five-petaled flowers in shades of pink, purple, lavender-blue, and white. It is one of the most popular groundcovers for rock gardens, slopes, walls, and sunny borders, valued for erosion control and its spectacular spring display.

Fun facts

  • The epithet 'subulata' means awl-shaped, referring to the stiff, needle-like leaves that give the mats their moss-like look.
  • In peak bloom the flowers can cover the foliage so completely that the planting reads as a solid sheet of color.
  • The mats stay evergreen (or semi-evergreen) through winter, often taking on bronze or purplish tones in cold weather.
  • The nectar-rich spring flowers are an early food source for butterflies, bees, and hummingbird moths.

Care summary

Sun Full sun; tolerates light shade
Water Drought tolerant once established; water during prolonged dry spells
Soil Well-drained, sandy or gritty soil; dislikes wet, heavy clay
Hardiness Zones 3–9
Mature height 10–15 cm (4–6 in)
Pet safe Non-toxic to cats, dogs, and horses per the ASPCA
Difficulty Easy
Propagation By stem cuttings after flowering or division in spring

Make your own Moss phlox · Creeping phlox · Moss pink · Mountain phlox profile

Common problems

    • Grow in gritty, fast-draining soil
    • Site in full sun on a slope
    • Keep mulch away from crowns
    • Remove and bin rotting sections
    • Hose plants with firm water spray
    • Keep soil evenly moist
    • Lift and divide mats in early autumn
    • Replant healthy rooted outer shoots
    • Cut out dead central growth
    • Shear lightly after flowering
    • Move to full sun
    • Cut back shading overhanging branches
    • Avoid high-nitrogen feeding