Illustration
Opening Act White
Phlox 'Opening Act White'
Also called opening act white phlox and opening act white garden phlox
Opening Act White blooms from June through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Opening Act White
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 20 in tall and 20 in wide at maturity, in roughly 2 years (a house reading).
No toxicity note is on file for Opening Act White. 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 Opening Act White
Plant Opening Act White 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 June to July.
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 Opening Act White get?
20 intall5 ft 7 inan adult20 inwideSee Opening Act White 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 Opening Act White
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Opening Act White about 20 in apart, center to center, so each plant has room to reach its full width.
Add Opening Act White 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
Opening Act White's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 8 published sources on September 26, 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.
- Walters Gardensthe breeder and introducerheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases and pests
- plants.seoanelandscape.comNetPS Plant Finder entry, as printed by Seoane's Garden Center (Abingt...height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- Plant Addictsa store that sells the plant; the queue's storeheight, spread, hardiness zones, sun, water, bloom months and color and diseases
- Proven Winnersthe brand Walters Gardens markets the plant underheight, spread, hardiness zones, sun, water, bloom months and color and soil
- US plant patent (Google Patents)US Plant Patent PP27,461 (Hans A. Hansen, assigned to Walters Gardens,...height, spread, hardiness zones, bloom months and color, trait tags, soil and diseases
- Chicago Botanic GardenGlencoe, Illinoisheight, hardiness zones, sun, water, bloom months and color and trait tags
- pridescorner.comPrides Corner Farms (a wholesale grower, Lebanon, Connecticut)height, hardiness zones, sun, water and bloom months and color
- Plant AddictsAre Phlox Poisonous?, a genus-level articletoxicity
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.