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The Plant Guide

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Blue phlox

Phlox divaricata 'Blue Moon'

floks div-air-ih-KAY-tah

This cultivar of the popular blue phlox has round, full flowers with overlapping petals. It is noteworthy for its particularly rich blue-violet color. Use it in rock gardens or alpine houses, in a dry wall, or as edging.

Noteworthy CharacteristicsSpreads by roots, creating a semi-evergreen groundcover.

CareGrow in humus-rich, fertile, moist but well-drained soil in part shade.

PropagationInsert basal cuttings in spring, or take root cuttings in early autumn or winter.

ProblemsPowdery mildew, stem canker, rust, Southern blight, stem nematodes, Cercospora and Septoria leaf spots, leaf miners, and caterpillars.

  • Genus : Phlox
  • Plant Height : 1 to 3 feet
  • Plant Width : 1 to 3 feet
  • Zones : 4, 5, 6, 7, 8
  • Bloom Time : Early Spring, Spring
  • Characteristics : Fragrant Flowers, Self Seeds
  • Maintenance : Low
  • Moisture : Medium Moisture
  • Light : Partial Shade
  • Plant Type : Perennials
  • Plant Seasonal Interest : Spring Interest
View Comments


  1. JimmyMcCoy 06/02/2016

    I bought a small pot of ‘Blue Moon’ woodland phlox (Phlox divaricata)
    in 2013. It was kind of over its bloom period when I bought it, so I
    didn’t expect much. The following year, it was nice enough, but nothing
    to write home about.

    1. tony_spencer 12/09/2016

      Geez Jimmy. You need more than one.

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