Desert Mallow (Sphaeralcea ambigua)

Desert Mallow

Sphaeralcea ambigua

Soft, fuzzy foliage glows like desert sunshine. Drought-tolerant flowering shrub; common names: Desert Mallow, Globe Mallow.

Full sun
0–1/week
Beginner
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Plant Needs

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Sunlight Requires full sun for abundant flowering; tolerates intense desert heat and occasional partial shade with reduced bloom output
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Watering Drought-tolerant; water deeply once every 1–2 weeks in growing season, suspend watering during cool, wet winter periods
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Temperature Hardy to -10°C; thrives in hot, arid conditions; avoid prolonged frost exposure
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Characteristics

  • Leaf: Round to heart-shaped, gray-green, densely covered in soft white hairs to reduce water loss
  • Flower: Trumpet-shaped, 2–3 cm wide, orange to coral-pink, clustered at upper stem tips
  • Stem: Woody at base, slender upper stems covered in fine, silvery hairs
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Care Guide

Watering

Water deeply every 10–14 days; allow soil to dry completely between waterings to prevent root rot

Fertilization

Apply diluted balanced organic feed once at the start of growing season. Do not fertilize in winter when the plant is dormant

Eggshell powder top dressing:Crush dried eggshells into fine powder; sprinkle lightly on soil surface 3–4 times per year; avoid direct contact with plant stems to prevent mold growth
Pruning
  • Prune back dead or damaged stems to 10–15 cm above soil level in early spring to stimulate new growth
  • Thin overcrowded branches to improve airflow and reduce disease risk
  • Remove spent flower heads to extend the flowering period by 1–2 weeks
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported adverse effects

Humans: No known toxicity to humans; safe for handling and accidental ingestion in small amounts

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Garden Uses & Culture

Culture: Symbolizes resilience in arid landscapes; popular in water-wise xeriscape gardening

Usage: Ornamental landscape plant; attracts native pollinators including bees and hummingbirds