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Phlox divaricata ssp. laphamii (Lapham's phlox)
Cressler, Alan

Phlox divaricata ssp. laphamii

Phlox divaricata L. ssp. laphamii (Alph. Wood) Wherry

Lapham's Phlox, Blue Phlox, Sweet William

Polemoniaceae (Phlox Family)

Synonym(s): Phlox divaricata var. laphamii


USDA Native Status: L48 (N)

Lapham’s Blue Phlox has semi-decumbent stems that send up erect branches 12-30 in. Loose clusters of showy, fragrant, usually purple flowers, with a dark "eye," occur at the top of these stems. The leaves on decumbent stems are broader than those on flowering stems.


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Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Capsule
Size Notes: Up to about 30 inches tall.

Bloom Information

Bloom Color: White , Purple , Violet
Bloom Time: Mar , Apr , May , Jun , Jul
Bloom Notes: Purple to lavender to violet, occasionally white.


USA: AL , AR , FL , GA , IA , IL , IN , KS , KY , LA , MD , MN , MO , MS , NC , NE , OK , PA , SD , TN , TX , VA , WI , WV
Native Distribution: WI to e. NE, s. & e. to FL & e. TX
Native Habitat: Moist, deciduous woods

Growing Conditions

Light Requirement: Part Shade
Soil pH: Circumneutral (pH 6.8-7.2)
Soil Description: Humus-rich, moist soils.
Conditions Comments: Blue phlox self-sows readily forming natural drifts.


Description: Propagate by division, seed or "softwood" cuttings (rooted stem) taken in late spring.
Seed Treatment: Cold-moist stratification.
Commercially Avail: yes


Bibref 318 - Native Texas Plants: Landscaping Region by Region (2002) Wasowski, S. & A. Wasowski

Search More Titles in Bibliography

Web Reference

Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Phlox divaricata ssp. laphamii in USDA Plants
FNA: Find Phlox divaricata ssp. laphamii in the Flora of North America (if available)
Google: Search Google for Phlox divaricata ssp. laphamii


Record Modified: 2023-02-22
Research By: TWC Staff

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