Genus: Phlox

Phlox

Photo/Illustration: 
Courtesy of Bluestone Perennials
(Phlox)
floks
Polemoniaceae
Phlox is a genus of about 70 species of North American (except for one) perennials, as well as a few annuals and shrubs. Their showy, sometimes fragrant, flowers are salverform or funnel-shaped with 5 flat petal lobes at the end. Growth habits vary from mat- and cushion-forming to trailing to tall and erect. Various species are useful as groundcover, in beds or borders, in the rock garden, or as edging.  
Noteworthy characteristics:  All species except for one are from North America. Flowers are 5-petal lobed and are sometimes fragrant.
Care:  Annuals prefer any fertile, well-drained soil in full sun. Growth requirements of the perennials and shrubs vary by species. Tall cultivars need staking.
Propagation: 

Sow seed of annuals at 55° to 64°F in early spring; sow seed of perennials in containers in a cold frame when ripe or in spring. Some species can be divided. Take basal cuttings in spring, root cuttings in early autumn or winter, and softwood cuttings of cushion-forming perennials in spring. For the trailing perennials, detach rooted stem pieces in spring or fall.

Species, varieties and clutivars for genus Phlox

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Blue phlox
Phlox divaricata 'Blue Moon'
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Blue phlox
Phlox divaricata 'Clouds of Perfume'
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Blue phlox
Phlox divaricata and cvs.
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Meadow phlox
Phlox maculata
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Garden phlox
Phlox paniculata
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Volcano® Phlox Purple
Phlox paniculata 'Barthirtythree'
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'Bright Eyes' garden phlox
Phlox paniculata 'Bright Eyes'
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Border phlox
Phlox paniculata 'David'
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'John Fanick' garden phlox
Phlox paniculata 'John Fanick'
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Creeping phlox
Phlox stolonifera
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Moss phlox
Phlox subulata
Problems: 

Powdery mildew, stem canker, rust, Southern blight, stem nematodes, leaf spots, leaf miners, caterpillars.