Illustration
White Agapanthus
Agapanthus 'Albus'
White Agapanthus blooms from June through August.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing White Agapanthus
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 8–11. Expect it to reach about 2.5 ft tall and 1.5 ft 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 White Agapanthus
White Agapanthus 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 White Agapanthus get?
2.5 fttall5 ft 7 inan adult1.5 ftwideSee White Agapanthus 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
White Agapanthus' height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 10 published sources on August 21, 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.
- University of Florida IFASAgapanthus spp. and hybridsheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- midvalleytrees.comMid Valley Treesheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and pests
- NC State ExtensionAgapanthus, genus page listing 'Albus'hardiness zones, sun, bloom months and color, trait tags, soil, diseases, pests and toxicity
- plantsexpress.comPlants Expressheight, spread, hardiness zones, sun, water, bloom months and color, trait tags and soil
- devilmountainnursery.comDevil Mountain Wholesale Nurseryheight, spread, hardiness zones, sun, water and trait tags
- Missouri Botanical GardenPlant Finderhardiness zones, sun, water, bloom months and color and diseases
- tynursery.comT-Y Nurseryheight, spread, hardiness zones, sun, water and trait tags
- elnativogrowers.comEl Nativo Growersheight, spread and sun
- Missouri Botanical GardenAgapanthus africanus, species pagehardiness zones, sun and trait tags
- RHSRoyal Horticultural Societyheight, spread and sun
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about White Agapanthus
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.