Illustration
Red Ranunculus
Ranunculus asiaticus
Red Ranunculus blooms from April through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Red Ranunculus
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 8–10. Expect it to reach about 16 in tall and 6 in wide at maturity, in roughly 1 year (not yet checked).
What was checked
Mature height and spread, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not, and each fact above says which. 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 Red Ranunculus
Red Ranunculus is a tender bulb, hardy in the ground only in zones 8 to 10: there it goes in during the cool season, typically November or December in zone 9, ahead of its April to May bloom. Colder than zone 8 it will not survive winter in the ground, so grow it in a pot that comes indoors before frost, or plant it out in spring for one season.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 9, the middle of this plant's hardy range, start with zone 9 in November. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Red Ranunculus get?
16 intall5 ft 7 inan adult6 inwideSee Red Ranunculus 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
Red Ranunculus' height, spread, hardiness zones, sun and trait tags were checked against 4 published sources on July 29, 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 ExtensionPlant Toolboxheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical Gardenheight, spread, hardiness zones and sun
- RHSRoyal Horticultural Societyheight, spread and sun
- Clemson Home and Garden Information CenterClemson Cooperative Extension HGICsun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Red Ranunculus
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
All parts are poisonous, and it is toxic to dogs, cats and horses. Crushed or chewed fresh tissue releases an irritant that burns skin, mouth and gut. per ASPCA and NC State
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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.