Portia Tree (Thespesia populnea)

Portia Tree

Thespesia populnea

Its cup-shaped blooms glow like tropical sunset embers. Evergreen flowering tree; common names: Portia Tree, Pacific Rosewood.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; highly tolerant of coastal salt spray and windy conditions
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Watering Water deeply but allow the top 5–10 cm of soil to dry between waterings; drought-tolerant once established
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Temperature Thrives in warm tropical to subtropical temperatures; cannot tolerate frost or prolonged temperatures below 10°C
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Characteristics

  • Leaf: Heart-shaped, glossy green, 7–18 cm long; alternate arrangement with pointed tips
  • Flower: Cup-shaped, 7–10 cm wide; yellow petals that fade to reddish-pink as they mature
  • Stem/Bark: Smooth grey-brown bark; young stems covered in fine, soft hairs
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Care Guide

Watering

Keep soil consistently moist during active growth periods

Fertilization

Apply a balanced slow-release fertilizer once at the start of growth. Avoid high-nitrogen fertilizers to prevent excessive foliage growth at the expense of flowers

Composted banana peel tea:Fully compost banana peels first, then steep in water for 24 hours; dilute 1:20 before applying as a root drench to avoid nutrient burn
Pruning
  • Remove dead, damaged, or crossing branches in early spring to improve canopy airflow
  • Thin crowded inner branches to increase light penetration to lower foliage
  • Shape the canopy lightly immediately after flowering to maintain a neat, rounded form
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Not listed as toxic to cats by the ASPCA

Humans: No documented toxic effects on humans

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Garden Uses & Culture

Culture: Used in traditional Pacific Island medicine for treating skin conditions and as a source of durable timber for canoe building

Usage: Ornamental landscape tree; coastal erosion control; craft timber production