Scarlet Monkeyflower (Mimulus cardinalis)

Scarlet Monkeyflower

Mimulus cardinalis

Vibrant red blooms mimic monkey faces, a cheerful garden staple. Herbaceous perennial; common name: cardinal monkeyflower.

Full sun
2–3/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; provide afternoon shade in hot, arid regions to prevent leaf scorch
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Watering Keep soil consistently moist but not waterlogged; avoid allowing the top 2 cm of soil to dry out completely
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Temperature Hardy to 0°C; prefers cool to temperate temperatures; protect from extreme heat above 35°C
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Characteristics

  • Leaf: Opposite, lanceolate to ovate leaves with serrated margins; medium green, slightly fuzzy texture
  • Flower: Tubular bright red two-lipped blooms, 3–5 cm long, resembling monkey faces
  • Stem: Erect, square green stems covered in fine, soft hairs
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Care Guide

Watering

Maintain even soil moisture; water when top 2 cm of soil feels dry

Fertilization

Diluted balanced liquid feed every 2 weeks. Avoid over-fertilizing to prevent leggy growth; stop feeding in late autumn

Banana peel compost tea:Compost banana peels for 2 weeks, steep in water for 24 hours, dilute 1:20 with water for root drench; discard solid peels to avoid pest infestations
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering throughout the growing season
  • Cut back stems to 10 cm above soil level in late autumn to promote vigorous new growth in spring
  • Thin overcrowded clumps every 2–3 years to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

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

Humans: No known toxic effects on humans per ASPCA and horticultural sources

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden plant; attracts hummingbirds and native pollinators