Rocky Mountain Zinnia

Zinnia grandiflora

Easy · Beginner friendly

About Rocky Mountain Zinnia

Plains Zinnia, also called Prairie Zinnia or Rocky Mountain Zinnia, is a tough perennial native to the dry plains and foothills of the southwestern United States from Kansas and Colorado south through Arizona and New Mexico. Forming low spreading mats just 4 to 8 inches tall and 12 to 18 inches wide, it produces an abundance of cheerful golden-yellow daisy flowers from late spring through fall. A miniature wildflower powerhouse for the most challenging xeric sites.

Drought-tolerant
Groundcover
Long-blooming
Native

WATER

Regular

Top inch dry

LIGHT

Full sun

6+ hrs direct

HARDY

Hardy to -30°F (-34°C)

USDA hardiness zones 4–10

How to care for Rocky Mountain Zinnia

Watering

Springevery 10 days
Summerevery 7 days
Fallevery 14 days
Winterpause watering

Soil · Well-draining

Top dressingPine bark mulch10%
Main mixPotting soil + perlite 2:170%
DrainageLECA / gravel20%

Never skip the drainage layer — standing water is the top cause of root rot.

FERTILIZER

Springevery 60 days

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At a Glance

NativeNorth America
Height0.5–1 ft (0.2–0.3 m)
Spread1–2 ft (0.3–0.6 m)
Flower colorYellow
Foliage colorGreen
SoilSandy, Well-drained
LocationsYard · Balcony

Bloom time

BLOOM CYCLE

Peak bloom

May–Oct

Golden-yellow daisy flowers May to October

Toxicity

Pets Safe

None reported

HumansDogsCats

Unknown

EXPOSURE Unspecified plant material.

EFFECT Toxic effects are not specified.

NOTE Toxicity for humans is not well documented; use caution until verified.

Safe

EXPOSURE No exposure route is reported.

EFFECT No toxic effect is reported.

NOTE Listed as non-toxic for dogs; avoid eating ornamental plants unless confirmed edible.

Safe

EXPOSURE No exposure route is reported.

EFFECT No toxic effect is reported.

NOTE Listed as non-toxic for cats; avoid eating ornamental plants unless confirmed edible.

Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.

DISTRIBUTION

Native

North America

History

Illustrated historical scene for Rocky Mountain Zinnia

Zinnia grandiflora, called prairie zinnia or Rocky Mountain zinnia, is a low rhizomatous perennial native to dry plains, mesas, and rocky slopes from western Kansas and Oklahoma through Texas, New Mexico, Arizona, and Colorado into northern Mexico. American botanist Thomas Nuttall described the species in the 1840s from specimens collected on the southern plains. Indigenous peoples including the Navajo and Hopi used decoctions of the plant as an eye wash, children's remedy, and ceremonial medicine, and the Navajo consider it one of the four sacred plants used in Blessingway ceremonies.

Each plant produces a summer-long display of yellow daisy flowers on a foot-tall cushion of fine-textured foliage. Plant Select and high plains xeriscape programs have popularized it for native meadow plantings.

A signature wildflower of the shortgrass prairie and Southwest desert grasslands, Plains Zinnia has been celebrated by Southwest gardeners as a low-maintenance bloomer for the harshest sites. Promoted by High Country Gardens and other Southwest native nurseries.

Symbolism & meaning

What It Symbolizes

Rocky Mountain Zinnia is cheerful endurance running across the high plains, its small golden daisies blooming relentlessly through brutal dry summers. As a true icon of shortgrass prairie and desert, it expresses a prairie spirit of bright, modest persistence. In its sunlit carpets, hardship and happiness somehow ripen together on the same low stem.

Cheerful endurance — blooms relentlessly through harsh dry summer
Prairie spirit — icon of shortgrass plains and high desert

Where the Name Comes From

'Zinnia' honors Johann Gottfried Zinn (1727–1759), German botanist; 'grandiflora' means large-flowered relative to plant size.

Uses & Fun Facts

Low spreading mats fill parking strips and dry slopes
Long-blooming yellow daisies thrive in Southwest xeriscape gardens
Native blooms feed butterflies and small bees through summer

Related plants

More Zinnia plants

Plants with similar care

Frequently asked questions

How often should I water Rocky Mountain Zinnia?

Water about every 10 days during the growing season, and always let excess water drain away.

How much light does Rocky Mountain Zinnia need?

Full sun: 6+ hrs direct. Watch the leaves — scorching or stretching means the light needs adjusting.

Is Rocky Mountain Zinnia toxic to cats or dogs?

Pets Safe (Dogs Safe · Cats Safe) Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.

Is Rocky Mountain Zinnia easy to grow?

Yes — it is considered an easy, beginner-friendly plant.

When does Rocky Mountain Zinnia bloom?

It typically blooms May–Oct in the Northern Hemisphere.

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