in Tucson, Phoenix,
and Southern California

Gardening in Tucson, Phoenix, and Southern California

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Zinnia grandiflora: Rocky Mountain Zinnia

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Form: A shrub with herbaceous stems on a woody base.
Leaf retention: Dies to ground in winter.
Growth rate: Moderate to rapid.
Mature Size: 12" high and 15" wide.
Flowers: Yellow, 3-6 rays, orange center, 1" wide.
Bloom: Mid summer to end of fall.
Fruit: Thin, dry, seed capsule.
Leaves: Gray-green, narrow.
Stems: No thorns. Greenish, much-branched.
Roots: Spreads by rhizomes.
Wildlife: Attracts small butterflies, bees and birds. Avoided by rabbits and deer.
Toxic / Danger: No.
Origin: Southwestern United States and Mexico.

Cultivation and Uses
USDA hardiness zones: 4-9.
Heat tolerant: Yes.
Drought tolerant: Yes.
Sun: Full sun to part shade.
Water once established: Monthly. Too much water can harm plant.
Soil: Well drained, dry, pH 5.6-8.5 (acidic to alkaline).
Litter: Low.
Propagation: Usually cuttings. Self-seeds under favorable circumstances.
Uses: Ornamental, erosion control on steep, sandy slopes.

Other common names are Prairie Zinnia, Little Golden Zinnia.

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