Illustration
Cloudburst Phlox
Phlox 'Cloudburst'
Also called cloudburst tall cushion phlox
Also comes in pink.
Cloudburst Phlox blooms from July through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Cloudburst Phlox
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 2.5 ft tall and 3.5 ft wide at maturity, in roughly 2 years (a house reading).
Pets
- No toxic listing found for dogs and cats in the sources we check.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
No toxicity note is on file for Cloudburst Phlox. That is not a clearance: check its safety for people and pets before planting.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Cloudburst Phlox
Plant Cloudburst Phlox in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 4 to 8, spring means March to May and fall means August or September. Once settled, it blooms from July to October.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Cloudburst Phlox get?
2.5 fttall5 ft 7 inan adult3.5 ftwideSee Cloudburst Phlox in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Cloudburst Phlox
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Cloudburst Phlox about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add Cloudburst Phlox to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Cloudburst Phlox's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 8 published sources on October 17, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- greatgardenplants.comGreat Garden Plants (Michigan nursery)height, spread, hardiness zones, sun, water, bloom months and color and trait tags
- gardencrossings.comGarden Crossings (Zeeland, Michigan nursery)height, spread, hardiness zones, sun, water and bloom months and color
- Walters Gardensbreeder and introducer, Zeeland, Michiganheight, spread, hardiness zones, sun, bloom months and color and trait tags
- Chicago Botanic GardenGlencoe, Illinoisheight, hardiness zones, sun, bloom months and color and trait tags
- grownbyoverdevest.comOverdevest Nurseries (Bridgeton, New Jersey)height, spread, sun, water and bloom months and color
- Plant Addictsqueue storeheight, spread, hardiness zones, sun, water and trait tags
- Proven Winnersthe Walters Gardens brandheight, spread, hardiness zones, sun and bloom months and color
- heritagehillnurseryinc.comHeritage Hill Nursery (Cedarburg, Wisconsin)height, spread, hardiness zones and bloom months and color
How the checking works, and what each standard covers, is on the verified plants page.
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Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.