How to Grow Phlox paniculata — Garden Phlox

phlox paniculata.
Purple flowers selective focus.

Garden phlox–botanical name Phlox paniculata– bears fragrant, five-petaled flowers in clusters from early summer to mid-autumn. The fragrant flowers are white or pale to dark lilac. Garden phlox is an herbaceous perennial with lance-shaped toothed, thin leaves, a good choice for mass plantings and borders.

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Get to Know Phlox paniculata — Garden Phlox

  • Plant type: Perennial
  • Growing Zones and range: 4-8
  • Hardiness: Hardy to -35° (-37°C)
  • Height and width: 24 inches to 4 feet (1.2m) tall; 24 to 39 inches (60-100cm) wide
  • Foliage: Ovate or lance-shaped to elliptic, toothed, thin leaves 2 to 5 inches (1.5-2.5cm) long
  • Flowers: Salverform (a narrow tube with petals bent abruptly outward at right angles) blossoms on panicle-like cymes
  • Flower colors: Wild forms are magenta; hybrids are shades of pink, red, lilac, or white and some are bicolored
  • Bloom time: Early, mid-, or late summer depending on the variety
  • Uses: Mass plantings, borders
  • Common name: Garden phlox, summer phlox
  • Botanical name: Phlox paniculata
  • Family: Polemoniaceae
  • Origin: North America

Where to Plant Phlox paniculata

  • Plant garden phlox in full sun in Zones 3-6; plant in light shade in hot-summer regions in Zones 7-9.
  • Grow phlox in compost-rich, well-drained soil.
Garden phlox, Phlox paniculata
Garden phlox, Phlox paniculata

When to Plant Phlox paniculata

  • Set garden phlox in the garden in spring or fall.

Planting and Spacing Phlox paniculata

  • Space garden phlox 18 to 24 inches apart. Space plants so that they are not crowded; crowded plants are susceptible to mildew.

How to Water and Feed Phlox paniculata

  • Garden phlox wants ample moisture; do not let the soil dry out.
  • Fertilize garden phlox with an all-purpose, slow-release fertilizer each spring.

Phlox paniculata Care

  • Mulch around garden phlox to conserve soil moisture.
  • Cut garden phlox back by one-third after blooming to encourage new blooms.
  • Cut back garden phlox that is attacked by mildew.

Phlox paniculata Propagation

  • Phlox paniculata seeds will germinate in 5-10 days at 60-65°F (16-18°C)

Phlox paniculata Varieties to Grow

  • There are numerous cultivars of Phlox paniculata.
  • Mildew-resistant cultivars include ‘Miss Lingard’, ‘Mt. Fuji’, ‘David’, ‘Franz Schubert, and ‘Eva Cullum’.
  • Phlox maculata, also called wild sweet William or spotted phlox is more mildew resistant than Phlox paniculata.

Phlox Drummondii (commonly Annual Phlox Or Drummond's Phlox)

How to Grow and Care for Annual Phlox


How to Grow Phlox stolonifera — Creeping Phlox