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PlantFiles: Creeping Phlox, Moss Phlox
Phlox subulata 'Emerald Blue'

Family: Polemoniaceae (po-le-moh-nee-AY-see-ee) (Info)
Genus: Phlox (floks) (Info)
Species: subulata (sub-yoo-LAH-tuh) (Info)
Cultivar: Emerald Blue
Additional cultivar information: (aka Blue Emerald)

8 vendors have this plant for sale.

22 members have or want this plant for trade.

View this plant in a garden


under 6 in. (15 cm)

18-24 in. (45-60 cm)

USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Full Sun

Unknown - Tell us

Bloom Color:

Bloom Time:
Mid Spring


Other details:
Drought-tolerant; suitable for xeriscaping

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From herbaceous stem cuttings
By simple layering
By stooling or mound layering

Seed Collecting:
N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed

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By victorgardener
Thumbnail #1 of Phlox subulata by victorgardener

By Galanthophile
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By Galanthophile
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By kniphofia
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By Gabrielle
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By sanannie
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By victorgardener
Thumbnail #7 of Phlox subulata by victorgardener

There are a total of 32 photos.
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5 positives
1 neutral
No negatives

Gardeners' Notes:

Positive ms_greenjeans On Apr 30, 2012, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

I needed some companions to crackerjack phlox, and I selected Emerald Blue. It's lovely; I find it a bit taller (or as I call it "puffier") than crackerjack. It blooms prolifically and fills in around the rocks in my rock garden very nicely.

Neutral Massgirl On Jul 6, 2010, Massgirl from Franklin, MA wrote:

I bought two of these and one Fort Hill this past early spring. By far, Fort Hill looked the best and so far is surviving the best out of the lot! One of the Emerald Blue was eaten by something (bunny or woodchuck, I'm not sure because I have both!!) - chewed all the green clean off. It does look like it's recovering though, with green leaf growing in. But the Fort Hill wasn't touched, and it still looks green and lush in July, zone 6. The Emerald Blue that was not eaten, is not looking so good. Bare in some spots, dying on others. I hope they all come back next year okay!
By far though, Fort Hill has been looking great, whether in bloom or not! We'll see how it goes next year!

Positive CarrolltonGardener On May 16, 2010, CarrolltonGardener from Carrollton, TX wrote:

It's silly but I love this little plant. The beautiful mossy dark green ground cover grows quickly to cover areas and when it blooms in spring it creates a blanket of color. In North Dallas where we are it was covered in snow twice this winter and emerged beautifully after the fallen leaves were removed to reveal it. Perfect for rock gardens or on the edge of gardens and as I use it, between other perennials and annuals.

Positive Erutuon On Apr 26, 2010, Erutuon from Minneapolis, MN wrote:

My plant was from a friend, so I don't know what variety it is. The color is lavender, and looks more or less like this variety, though.

Positive outdoorlover On Apr 15, 2008, outdoorlover from Enid, OK (Zone 7a) wrote:

This is a beautiful little plant which grows rather slowly. It flowers for an extended time in the spring in our region. I plan to propagate it soon to spread it out.

Positive Gabrielle On Jan 28, 2006, Gabrielle from (Zone 5a) wrote:

Blooms late April to late May in my garden.

I love 'Blue Emerald', but wish it grew a bit faster. My information says it is hardy in zones 2-10. Cut back to 3 inches in spring to encourage new growth.


This plant has been said to grow in the following regions:

San Leandro, California
Ellendale, Delaware
Iowa City, Iowa
Red Oak, Iowa
Franklin, Massachusetts
Uxbridge, Massachusetts
Royal Oak, Michigan
Hopkins, Minnesota
Minneapolis, Minnesota
Mathiston, Mississippi
Saint Louis, Missouri
Omaha, Nebraska
Sandown, New Hampshire
Rio Rancho, New Mexico
Binghamton, New York
Lake Grove, New York
Concord, North Carolina
Elizabeth City, North Carolina
Raleigh, North Carolina
Belfield, North Dakota
Haviland, Ohio
Enid, Oklahoma
Hulbert, Oklahoma
Harrisburg, Pennsylvania
Mc Keesport, Pennsylvania
Osceola Mills, Pennsylvania
Easley, South Carolina
Inman, South Carolina
Greeneville, Tennessee
Knoxville, Tennessee
Carrollton, Texas
Fort Worth, Texas
Nevada, Texas
Salt Lake City, Utah
Richmond, Virginia
Moxee, Washington
Shelton, Washington
Milwaukee, Wisconsin

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