Illustration
Hollandia
Anemone coronaria 'Hollandia'
Hollandia blooms from March through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Hollandia
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 7–10. Expect it to reach about 12 in tall and 6 in wide at maturity, in roughly 1 year (checked).
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 Hollandia
Hollandia is a fall-planted bulb: get it in the ground 6 to 8 weeks before the ground freezes, typically October or November in zone 8, the middle of its hardy zones 7 to 10. It pays you back the following March to May.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 8, the middle of this plant's hardy range, start with zone 8 in October. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Hollandia get?
12 intall5 ft 7 inan adult6 inwideSee Hollandia in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
Where these facts come from
Hollandia's height, spread, hardiness zones, sun, water, bloom months and color, years to mature size, trait tags, soil, diseases, pests and toxicity were checked against 8 published sources on August 23, 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 Finderspread, hardiness zones, water, bloom months and color, soil, diseases and pests
- NC State ExtensionPlant Toolboxspread, hardiness zones, sun, soil, diseases, pests and toxicity
- RHSRoyal Horticultural Society (RHS)height, spread, sun, bloom months and color, trait tags and soil
- dutchgrown.comDutchGrownheight, hardiness zones, sun, bloom months and color and trait tags
- Breck'sheight, hardiness zones and bloom months and color
- nijssenbulbs.comPeter C. Nijssen (Nijssen Bulbs)height, bloom months and color and trait tags
- Longfield Gardenseducational articlebloom months and color and years to mature size
- terraceiafarms.comTerra Ceia Farmsheight, trait tags and pests
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Hollandia
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
All parts are poisonous. The sap holds protoanemonin, a vesicant: it reddens, swells and blisters skin, and eating it causes mouth pain, vomiting and diarrhea. per NC State and Cornell
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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.