Tree Mallow (Lavatera trimestris)

Tree Mallow

Lavatera trimestris

Its ruffled blooms unfurl like crumpled silk, a cheerful summer accent. Herbaceous annual flowering plant.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates hot afternoon sun in cool temperate regions
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Watering Water deeply when top 5 cm of soil is dry; avoid overwatering to prevent root rot
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Temperature Thrives in 15–25°C; tolerates light frost but performs best in warm summer conditions
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Characteristics

  • Leaf: Round to heart-shaped, softly hairy, with shallow rounded lobes
  • Flower: Ruffled trumpet-shaped blooms in pink, white, or lavender, 7–10 cm wide
  • Stem: Erect, green, covered in fine downy hairs
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Care Guide

Watering

Keep soil consistently moist during active growth

Fertilization

Diluted balanced feed every 2 weeks. Discontinue feeding once flowering slows in late autumn

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drench to avoid nutrient burn
Pruning
  • Deadhead spent blooms regularly to encourage continuous flowering
  • Trim leggy stems mid-summer to promote bushier, more compact growth
  • Remove yellowing foliage to improve air circulation and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

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

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden plant; cut flower for floral arrangements