Illustration
Mount Lemmon Marigold
Tagetes lemmonii
Also called copper canyon daisy
Also comes in orange.
Mount Lemmon Marigold blooms from October through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Mount Lemmon Marigold
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 9–10. Expect it to reach about 3.5 ft tall and 5.5 ft wide at maturity, in roughly 4 years (a house reading).
Is Mount Lemmon Marigold toxic to dogs or cats?
- Listed as toxic to dogs and cats by Pet Poison Helpline.
- 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 Mount Lemmon Marigold
Plant Mount Lemmon Marigold 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 9 to 10, spring means January to March and fall means October or November. Once settled, it blooms in October.
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 Mount Lemmon Marigold get?
3.5 fttall5 ft 7 inan adult5.5 ftwideSee Mount Lemmon Marigold 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 Mount Lemmon Marigold
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Mount Lemmon Marigold about 5.5 ft apart, center to center, so each plant has room to reach its full width.
Add Mount Lemmon Marigold 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
Mount Lemmon Marigold's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 7 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.
- asu.eduArizona State University, Chris A. Martin plant resourceheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- emerisa.comemerisa gardensheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- devilmountainnursery.comDevil Mountain Wholesale Nurseryheight, spread, hardiness zones, water, bloom months and color and trait tags
- apps.cals.arizona.eduUniversity of Arizona Campus Arboretumheight, spread, sun, water and bloom months and color
- nparks.gov.sgNational Parks Board, Singaporeheight, sun, water, bloom months and color and trait tags
- unf.eduUniversity of North Florida Botanical Gardenheight, sun, water and bloom months and color
- clemson.eduClemson University, South Carolina Botanical Gardenbloom 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: Arizona
Recorded growing wild in 3 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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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.