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Phlox (pronounced "flocks") is a genus of 67 species of annual or perennial flowering plants. Some species flower in early spring while others flower in summer into fall. Most species are native to temperate North America but a few species are also from northeastern Asia. They are found growing in diverse habitats from alpine locations to open woodlands and prairies.


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Phlox range in color from pale blue to bright red to white, though cultivars have been bred for purple and deep blue. Some species such as Phlox glaberrima (Smooth Phlox) grow to 1.5 m tall, while others, such as Phlox stolonifera (Creeping Phlox), form low mats only a few centimeters in height. Seeds are in a 3-celled, valved capsule, with one seed to each cell.

The flowers are 5-lobed, with a tube below the lobes. The flower buds open by untwisting.

Growing conditions

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Phlox is best grown in fertile, well-drained soil, exposed to partial shade to partial sun.


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Moss phlox
Phlox flowers

Phloxes are grown for their showy, often fragrant flowers in borders and cutting gardens. They attract both butterflies and hummingbirds.


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Deadheading and staking are often needed for taller species.


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Division, cuttings, or seed.

Pests and diseases

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Crown Gall

Powdery Mildew

Leaf Spots

  • Ascochyta phlogis var. pholgina
  • Cercospora omphakodes
  • Cercospora phlogina
  • Macrophoma cylindrospora
  • Phyllosticta sp.
  • Ramularia sp.
  • Septoria divaricata
  • Stemphylium botryosum


Crown Rots



  • Puccinia douglassii
  • Uromyces acuminates var. polemonii


  • Mosaic



Aphids Scales







The foliage of Phlox is sometimes eaten by the larvae of some Lepidoptera species including Dot Moth, Gazoryctra wielgusi, w:Hummingbird Hawk-moth and Schinia indiana which feeds exclusively on P. pilosa. Phlox species are also a popular food source for groundhogs, rabbits and deer.


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  • Pirone, Pascal P. (1978). Diseases & Pests of Ornamental Plants (Fifth Edition ed.). John Wiley & Sons, New York. pp. 401–403. {{cite book}}: |edition= has extra text (help); Cite has empty unknown parameter: |coauthors= (help)
  • Cranshaw, Whitney (2004). Garden Insects of North America: The Ultimate Guide to Backyard Bugs. Princeton University Press. p. 611. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
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