Phlox – ‘Cloudburst’

Garden Height
26 - 28
38 - 42
38 - 42
Container Role
Flower Size
Flower Colors
Light Code
Light Level
Proven Winners


  • Fragrant Flower
  • Long Blooming
  • Native to North America
  • Fall Interest

Attracts: Hummingbirds

Maintenance Notes:

Grows best in consistently moist, well-drained soil and full sun. Thrives with regular fertilization. Provide good air circulation.

Needs Good Drainage

Maintenance Category: Easy

Water Category: Average

Bloom Time: Late Summer

Hardiness Zones: 8b

Flower Form: Mass Planting

Soil Fertility: Fertile Soil

Soil PH Category: Neutral Soil

pH: C - pH 6.0 - 6.5

EC (2:1 Extraction Method): 0.8

Fertilization: 75 - 200

Light Requirements: High

Water Requirements: Moderate to Moist

Rooting Out Temperature: 65 - 72° Fahrenheit

Growing On Temperature: 55 - 72° Fahrenheit

Holding Temperature: 40 - 50° Fahrenheit

Planting and Timing Information:

Late Spring through Fall Finish. Standard PPP.

Finishing Times [weeks]:

4-5" and Quart Pot: 6-8
6" and Gallon Pot: 10-12
7-9" Pot: 10-12

Pinching and Growth Regulators:

Soft Pinch when the plant is 3 to 4 inches tall. The lower the plant breaks the better the plant quality. If flowering is desired, allow 10 to 12 weeks after the onset of long days for flowering. 'Shockwave' is grown for foliage as much as flowers and may have a shorter crop time since flowers are unnecessary for sales.


Pest and Disease Management:

General pest and disease practices as listed in notes.

Watch for aphids, spider mites and whiteflies, scout and treat as needed.

Leaf spots and powdery mildew can be problematic.

The Flame series of Phlox is less mildew susceptible than many that are available.

Grower Tips:

-Quart size plants are sold green rather than in flower.

-Good air circulation, high light levels and watering in the morning will help decrease disease incidence.

-Vernalization will increase plant vigor, decrease time to flower and improve uniformity of flowering.

-'Shockwave' can be used as a foliage interest plant in combinations.

-'Shockwave' performs best with fertilization rates between 75 and 100 ppm.

  • Proven Winners
  • Proven Winners