Illustration
Autumn Brilliance
Amelanchier × grandiflora 'Autumn Brilliance'
Autumn Brilliance blooms from April through April.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Autumn Brilliance
Plant it in part sun. It prefers moderate water. It is hardy in USDA zones 4–8. Expect it to reach about 20 ft tall and 16 ft wide at maturity, in roughly 10 years (a house reading).
What was checked
Fifteen fields were checked against named botanical sources, each recorded beside the sources that carried it, with every unsettled point written down and decided: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, soil, diseases, pests, toxicity, the plant's own names, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. 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 Autumn Brilliance
Plant Autumn Brilliance 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 in April.
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 Autumn Brilliance get?
20 fttall5 ft 7 inan adult16 ftwideSee Autumn Brilliance 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 Autumn Brilliance
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Autumn Brilliance about 16 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add Autumn Brilliance 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
Autumn Brilliance'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 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.
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- RHSRoyal Horticultural Societyheight, spread, sun, water, bloom months and color, soil, diseases, pests and toxicity
- The Morton Arboretumheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and diseases
- University of Minnesota Extensionheight, spread, hardiness zones, sun, water, bloom months and color, soil, diseases and pests
- NC State ExtensionPlant Toolboxhardiness zones, sun, water, bloom months and color, soil, diseases, pests and toxicity
- bowerandbranch.comBower & Branchheight, spread, hardiness zones, sun, bloom months and color and pests
- US plant patent (Google Patents)United States Plant Patent PP5717, Willet N. Wandell (via Google Paten...height, bloom months and color, trait tags and diseases
- trees.umn.eduUniversity of Minnesota UFOR Nursery and Labtoxicity
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Autumn Brilliance
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
The berries are edible, but the seeds, leaves and wood hold cyanogenic glycosides and can poison browsing livestock; the fruit itself is safe for people and birds. per PubMed Central and ASPCA
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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.