Louisiana Blue Phlox, Woodland Phlox, Wild Sweet William, Wild Blue Phlox 'Louisiana Purple'

Phlox divaricata

Family: Polemoniaceae (po-le-moh-nee-AY-see-ee) (Info)
Genus: Phlox (floks) (Info)
Species: divaricata (dy-vair-ih-KAY-tuh) (Info)
Cultivar: Louisiana Purple



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


12-15 in. (30-38 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:

Sun to Partial Shade

Light Shade



Bloom Color:



Bloom Time:

Mid Spring

Late Spring/Early Summer



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)

Patent Information:


Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From herbaceous stem cuttings

By simple layering

By serpentine layering

Seed Collecting:

Bag seedheads to capture ripening seed

Seed does not store well; sow as soon as possible


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

Wetumpka, Alabama

Dallas, Georgia

Hebron, Kentucky

New Orleans, Louisiana

Enid, Oklahoma

Deer Park, Texas

Rowlett, Texas

Seadrift, Texas

Leesburg, Virginia

show all

Gardeners' Notes:


On Apr 20, 2015, coriaceous from ROSLINDALE, MA wrote:

In a species with a bewildering number of cultivars in the same soft lavender-blue, the flower color is distinctive: a deeper purple-violet with a darker reddish eye. It makes a good color combination with forget-me-nots (which the species does not).

I've read that this may be an interspecies hybrid and not pure P. divaricata.

Needs a little sun to prevent powdery mildew.


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

This is a beautiful ground cover that blooms for many weeks in early spring. It is blooming now, and once the proper time for propagation is discovered, I'm going to spread it around. It is growing in almost full shade, although during the winter, it gets sun because there are no leaves on the trees.


On Jun 13, 2007, marysgarden from Wetumpka, AL wrote:

Grows and flowers well in almost full sun in my Zone 7b garden. Is evergreen through three winters so far.


On Apr 19, 2004, htop from San Antonio, TX (Zone 8b) wrote:

San Antonio, Tx.
I was lucky enough to find small transplants of the Phlox divaricata last year. I bought four to test them out to be sure that they would grow well in my location. They are planted under a crepe myrtle tree where they receive a few hours of morning sun and afternoon shade. I enriched the soil by adding a lot of compost. It took them quite sometime before they began to look robust and I was afraid that they may not do well. By the fall they had begun to spread (the word "divaricate" in the name means "widely spreading"). When cool weather arrived, the foliage began to develop a nice purplish tone. This spring they are thriving with bright green new foliage growing over the top of the purple tinged leaves and have been blooming for quite some time.

Alt... read more