Illustration
Aspen Fleabane
Erigeron speciosus
Also called showy fleabane, oregon fleabane, showy daisy and oregon daisy
Also comes in blue, white and pink.
Aspen Fleabane blooms from June through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Aspen Fleabane
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 5. Expect it to reach about 20 in tall and 20 in wide at maturity, in roughly 2 years (a house reading).
Is Aspen Fleabane toxic to dogs or cats?
- Listed as toxic to dogs and cats by NC State Extension.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
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 Aspen Fleabane
Plant Aspen Fleabane 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 5, the middle of its hardy zone 5, spring means April to June and fall means August or September. Once settled, it blooms from June to August.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Aspen Fleabane get?
20 intall5 ft 7 inan adult20 inwideSee Aspen Fleabane 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 Aspen Fleabane
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Aspen Fleabane about 20 in apart, center to center, so each plant has room to reach its full width.
Add Aspen Fleabane 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
Aspen Fleabane's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 8 published sources on November 5, 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 Extensionheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- Cornell Cooperative ExtensionCornell Universityheight, spread, hardiness zones, sun, water and bloom months and color
- unps.orgUtah Native Plant Societyheight, sun, water, bloom months and color and trait tags
- westernnativeseed.comWestern Native Seedheight, spread, hardiness zones, sun and bloom months and color
- cwelwnp.usu.eduWestern Native Plants, University of Wyoming Extension (Utah State Uni...height, spread, water and bloom months and color
- Portland Nurseryheight, sun and bloom months and color
- westernforbs.orgWestern Forbs, Great Basin Fire Science Exchange, Gucker and Shaw (2025)height, bloom months and color and trait tags
- yavapaiplants.extension.arizona.eduUniversity of Arizona Cooperative Extensionheight and bloom months and color
How the checking works, and what each standard covers, is on the verified plants page.
Where it grows wild
Native to 11 states and 2 provinces
United States: Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, South Dakota, Utah, Washington, Wyoming
Canada: Alberta, British Columbia
Recorded growing wild in 176 counties.
Range data from the World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 4.0, adapted) and USDA PLANTS. How the native range is credited.
1 more variety in the Fleabane group
Same genus, similar care - pick the one you are growing.
Across the group, bloom runs from April through August: Seaside Daisy opens first (April) and Aspen Fleabane is the last to finish (August).
Compare every variety in the Fleabane group
Every figure is the variety's own page fact. Tap a name to open it.
| Variety | Color | Blooms | Hardiness | Sun | Size (H × W) |
|---|---|---|---|---|---|
| Aspenthis page | Purple | Jun–Aug | Zones 5 | Full sun | 20 in × 20 in |
| Seaside Daisy | Pink | Apr–Aug | Zones 4–8 | Full sun | 8 in × 20 in |
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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.