Blue Phlox, Forest Phlox, Wild Sweet William, Woodland Phlox

Phlox divaricata subsp. laphamii

Family: Polemoniaceae (po-le-moh-nee-AY-see-ee) (Info)
Genus: Phlox (floks) (Info)
Species: divaricata subsp. laphamii
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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


Unknown - Tell us

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:

Unknown - Tell us

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:

Divernon, Illinois

Valparaiso, Indiana

Pacific Junction, Iowa

Hebron, Kentucky

Hopkins, Minnesota

Hudson, New Hampshire

Staten Island, New York

Enid, Oklahoma

Knoxville, Tennessee

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Gardeners' Notes:


On May 24, 2013, ms_greenjeans from Hopkins, MN (Zone 4a) wrote:

I planted one of these last year, and it came back bigger and better this year. It is blooming like crazy right now, and I love the color.


On May 19, 2013, plant_it from Valparaiso, IN wrote:

Beautiful plant. Native from Maine to South Dakota and Manitoba, south to Georgia, Alabama, Tennessee, Arkansas, and Oklahoma. Attracts butterflies and hummingbirds, enjoyed by rabbits.

I've seen it growing wild in partly shady undisturbed woodlands near my house.


On Apr 20, 2009, outdoorlover from Enid, OK (Zone 7a) wrote:

I love this plant because its beautiful light blue flowers appear early in the spring when not much else is flowering, and it flowers in the shade. It grows well in our clay soil. I have not been able to propagate it from stem cuttings yet, but am still trying as I would like to have it more places in our garden.