Phlox subulata Rocky Road periwinkle (Moss Phlox)

There are many selections of Moss Phlox, a garden favourite, all of them forming a low mound or cushion smothered by flowers in late spring. This selection, part of the Rocky Road series, produces a showy display of blue periwinkle-coloured flowers. Compared to P. subulata, these are reported to have a more compressed growth habit and spread more slowly in the landscape, especially the first year in the ground. Clip plants lightly immediately after blooming to encourage a dense habit. Wonderful in the sunny rock garden, for edging, or in mixed containers. Clumps may be ripped apart and divided in early fall, after 3 to 4 years. Requires good drainage. Drought tolerant, once established. 

 Sun Exposure  

  Full Sun

Soil Type 
  Normal or
  Sandy or
  Clay

Soil pH 
  Neutral or
  Alkaline or
  Acid

Soil Moisture 
  Dry

Care Level 
  Easy

Flower Colour 
Blue 

Blooming Time 
  Early Summer  
  Late Spring 

Foliage Color 
  Grey Green 

Plant Uses & Characteristics 
  Accent: Good Texture/Form  
  Alpine & Rock  
  Attracts Butterflies  
  Attracts Hummingbirds  
  Border  
  Containers  
  Deer Resistant  
  Edging  
  Fragrant  
  Massed 

Flower Head Size 
  Small 

Height 
   10-15 cm  
   4-6 inches

Spread 
   85-90 cm  
   33-35 inches

Foot Traffic 
   None 

Growth Rate 
   Medium