Illustration
White Bachelor's Button
Centaurea cyanus
White Bachelor's Button blooms from May through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing White Bachelor's Button
Plant it in full sun. It prefers low water. It is hardy in USDA zones 2–11. Expect it to reach about 2.5 ft tall and 1 ft wide at maturity, in roughly 1 year (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 White Bachelor's Button. That is not a clearance: check its safety for people and pets before planting.
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 White Bachelor's Button
Wait until all danger of frost has passed, then plant out White Bachelor's Button into warm soil; in most zones that means late spring. Planted then, it flowers from May 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 April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does White Bachelor's Button get?
2.5 fttall5 ft 7 inan adult1 ftwideSee White Bachelor's 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 White Bachelor's Button
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space White Bachelor's Button about 1 ft apart, center to center, so each plant has room to reach its full width.
Add White Bachelor's 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
White Bachelor's Button's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 10 published sources on October 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 Gardenheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- NC State Extensionheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- University of Illinois ExtensionIllinois Extensionheight, sun, water and bloom months and color
- threshseed.comThresh Seed Co.sun, bloom months and color and trait tags
- ag.missouristate.eduMissouri State Universityheight and sun
- Missouri Department of Conservationbloom months and color
- RHSRoyal Horticultural Societyheight and sun
- extension-store.montana.eduMontana State University Extensionheight
- jparkers.co.ukJ. Parker'sspread
- plantdatabase.kpu.caKwantlen Polytechnic Universityspread
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.