Illustration
Blue Moon Woodland Phlox
Phlox divaricata 'Blue Moon'
Also called blue moon phlox
Blue Moon Woodland Phlox blooms from April through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Blue Moon Woodland Phlox
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 12 in tall and 12 in wide at maturity, in roughly 2 years (a house reading).
Pets
- Not yet checked for pets.
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 Blue Moon Woodland 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 Blue Moon Woodland Phlox
Plant Blue Moon Woodland 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 April to May.
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 Blue Moon Woodland Phlox get?
12 intall5 ft 7 inan adult12 inwideSee Blue Moon Woodland 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 Blue Moon Woodland Phlox
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Blue Moon Woodland Phlox about 12 in apart, center to center, so each plant has room to reach its full width.
Add Blue Moon Woodland 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
Blue Moon Woodland Phlox's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 12 published sources on October 11, 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.
- North Creek Nurseriesa wholesale grower, Landenberg, Pennsylvaniaheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and diseases
- Plant Addictsthe queue's store; Brand: American Beauties Native Plantsheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- plants.hicksnurseries.comNetPS Plant Finder entry, as printed by Hicks Nurseries (Westbury, New...height, spread, hardiness zones, sun, water, bloom months and color, soil, diseases and pests
- abnativeplants.comAmerican Beauties Native Plants (the brand Plant Addicts sells it under)height, spread, hardiness zones, sun, water, bloom months and color, trait tags and soil
- Internet Archive (archived page)Wisconsin Master Gardener Horticulture Information article (Susan Mahr...height, hardiness zones, sun, water, bloom months and color, soil, diseases and pests
- NC State Extensionspecies page, Phlox divaricataheight, hardiness zones, sun, water, bloom months and color, soil, diseases and pests
- phipps.conservatory.orgIzel Native Plants plant sheet (the IzelPlants.com logo and layout), a...height, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- growersoutlet.comGrower's Outlet LLC plant sheet (a grower selling direct, Loganville,...height, spread, hardiness zones, sun, water, bloom months and color and soil
- plantfinder.nativeplanttrust.orgNative Plant Trust Plant Finder (Garden in the Woods, Framingham, Mass...height, spread, hardiness zones, sun, water and bloom months and color
- Mt. Cuba CenterPhlox for Shade for the Mid-Atlantic Region, Hockessin, Delawareheight, spread, sun and bloom months and color
- gcamerica.orgThe Garden Club of America (2022 Plant of the Year, Freeman Medal)bloom months and color, trait tags and diseases
- 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.