Illustration
Amethyst Dream Bachelor Button
Centaurea montana 'Amethyst Dream'
Also called amethyst dream mountain bluet and amethyst dream perennial cornflower
Amethyst Dream Bachelor Button blooms from May through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Amethyst Dream Bachelor Button
Plant it in full sun. It prefers low water. It is hardy in USDA zones 3–8. Expect it to reach about 20 in tall and 24 in wide at maturity, in roughly 2 years (a house reading).
No toxicity note is on file for Amethyst Dream Bachelor Button. 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 Amethyst Dream Bachelor Button
Plant Amethyst Dream Bachelor Button 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 zones 3 to 8, spring means April to June and fall means August or September. Once settled, it blooms from May to June.
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 Amethyst Dream Bachelor Button get?
20 intall5 ft 7 inan adult24 inwideSee Amethyst Dream Bachelor Button 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 Amethyst Dream Bachelor Button
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Amethyst Dream Bachelor Button about 24 in apart, center to center, so each plant has room to reach its full width.
Add Amethyst Dream Bachelor Button 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
Amethyst Dream Bachelor Button's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 11 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.
- Perennials.com (Heritage Perennials)Heritage Perennials (perennials.com, Valleybrook)height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- Plant Addictsheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- info.ballseed.comBall Seed (Ball Horticultural Company; the PP20,781 licensor's catalog...height, spread, hardiness zones, water, bloom months and color and trait tags
- pridescorner.comPrides Corner Farmsheight, spread, hardiness zones, bloom months and color, trait tags and soil
- RHSRoyal Horticultural Societyheight, spread, bloom months and color, soil, diseases and pests
- Chicago Botanic GardenPlant Finderhardiness zones, sun, water, bloom months and color and trait tags
- Missouri Botanical GardenSPECIES page, Centaurea montanasun, water, bloom months and color, soil and diseases
- NC State ExtensionSPECIES page, Centaurea montanawater, soil and pests
- Plants For A Futuretrait tags, pests and toxicity
- US plant patent (Google Patents)Google Patents; inventor Elisabeth Sahin-Georgiadou, K. Sahin Zaden B.V.bloom months and color and diseases
- ASPCABachelors Buttons entry: Centaurea cyanus, ANOTHER SPECIES of the genustoxicity
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.