Illustration
White Mistflower
Ageratina havanensis
Also called shrubby boneset, white shrub mistflower and havana snakeroot
Also comes in pink.
White Mistflower blooms from April through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing White Mistflower
Plant it in full sun. It prefers low water. It is hardy in USDA zones 8–10. Expect it to reach about 4 ft tall and 3.5 ft wide at maturity, in roughly 4 years (a house reading).
Pets
- Not yet checked for pets.
- Listed as poisonous to people by NC State Extension.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
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 Mistflower
Plant White Mistflower in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 9, the middle of its hardy zones 8 to 10, spring means January to March and fall means October or November. Once settled, it blooms from April to July.
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 January. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does White Mistflower get?
4 fttall5 ft 7 inan adult3.5 ftwideSee White Mistflower 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 Mistflower
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space White Mistflower about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add White Mistflower 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 Mistflower's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 8 published sources on November 5, 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.
- texastreefarms.comTexas Tree Farmsheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- jfgarden.orgThe John Fairey Gardenheight, hardiness zones, sun, water, bloom months and color and trait tags
- texasnativeplantnursery.comEco Blossom Nurseryheight, spread, sun, water, bloom months and color and trait tags
- gardenstylesanantonio.comSan Antonio Water System, Garden Style San Antonioheight, spread, water, bloom months and color and trait tags
- Lady Bird Johnson Wildflower Centerheight, sun, water, bloom months and color and trait tags
- Plant Delights Nursery/ Juniper Level Botanic Gardenheight, spread, hardiness zones, sun and bloom months and color
- austintexas.govCity of Austinheight, spread and water
- centraltexasgardener.orgCentral Texas Gardener, Austin PBSbloom months and color
How the checking works, and what each standard covers, is on the verified plants page.
Where it grows wild
Native to 1 state
United States: Texas
Recorded growing wild in 16 counties.
Range data from the World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 4.0, adapted) and USDA PLANTS. How the native range is credited.
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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.