Illustration
Snowball
Agapanthus 'Snowball'
Snowball blooms from June through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Snowball
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 8–11. Expect it to reach about 20 in tall and 20 in wide at maturity, in roughly 2 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 Snowball
Snowball is tender: plant it out after the last frost, once the soil has warmed. In zone 9, the middle of its hardy zones 8 to 11, that means February or March; where spring comes later, it goes out later. Expect flowers from June to August.
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 February. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Snowball get?
20 intall5 ft 7 inan adult20 inwideSee Snowball 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
Snowball'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 20, 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.
- burncoose.co.ukBurncoose Nurseriesheight, spread, hardiness zones, sun, trait tags, soil, diseases, pests and toxicity
- NC State ExtensionPlant Toolboxhardiness zones, sun, bloom months and color, soil, diseases, pests and toxicity
- plants.beechwood-gardens.comBeechwood Gardens (NetPS plant database)height, spread, sun, water, bloom months and color, trait tags and soil
- urbantreefarm.comUrban Tree Farm Nurseryheight, spread, sun, water, bloom months and color, soil and pests
- Missouri Botanical GardenPlant Finderhardiness zones, water, bloom months and color and diseases
- gardenexpress.com.auGarden Expressheight, spread and bloom months and color
- University of Florida IFASUF/IFAS Gardening Solutionssoil, diseases and pests
- gardencentermarketing.comGarden Center Marketing (Clarity Connect garden-center database)spread and hardiness zones
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Snowball
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
The sap irritates skin, eyes and mouth (bitter steroidal saponins), and chewing causes vomiting and drooling in pets. It is not a true lily and causes no kidney failure. per Pet Poison Helpline and North Carolina
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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.