Illustration
White Annual Phlox
Phlox drummondii
White Annual Phlox blooms from May through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing White Annual Phlox
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 2–11. Expect it to reach about 12 in tall and 12 in wide at maturity, in roughly 1 year (not yet checked).
No toxicity note is on file for White Annual Phlox. That is not a clearance: check its safety for people and pets before planting.
What was checked
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. 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 White Annual Phlox
Wait until all danger of frost has passed, then plant out White Annual Phlox into warm soil; in most zones that means late spring. Planted then, it flowers from May to September.
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 April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does White Annual Phlox get?
12 intall5 ft 7 inan adult12 inwideSee White Annual 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 White Annual Phlox
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space White Annual Phlox about 12 in apart, center to center, so each plant has room to reach its full width.
Add White Annual 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
White Annual Phlox's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 9 published sources on August 24, 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.
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- Internet Archive (archived page)Clemson Cooperative Extension Home and Garden Information Center (read...height, hardiness zones, sun, water, bloom months and color, soil, diseases and pests
- Lady Bird Johnson Wildflower CenterThe University of Texas at Austinheight, sun, water, bloom months and color, trait tags, soil and pests
- Internet Archive (archived page)Texas A&M AgriLife Aggie Horticulture, text copyright Wildseed Farms (...height, sun, water, bloom months and color and soil
- University of Georgia ExtensionUniversity of Georgia Cooperative Extension (CAES), Bulletin 954height, hardiness zones, sun and bloom months and color
- US Forest ServiceUSDA Forest Service, Celebrating Wildflowersheight, water, bloom months and color and soil
- NC State ExtensionPlant Toolbox, genus Phloxsun and diseases
- Lady Bird Johnson Wildflower CenterAsk Mr. Smarty Plantstoxicity
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.