Creeping Phlox, Moss Phlox 'Emerald Blue'

Phlox subulata

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)
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Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Drought-tolerant; suitable for xeriscaping

Where to Grow:

Unknown - Tell us


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:

Unknown - Tell us

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


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

show all

Gardeners' Notes:


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.


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!


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.


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.


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.


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.