Headache Tree (Premna serratifolia)

Headache Tree

Premna serratifolia

Its serrated leaves hold quiet medicinal charm, a hardy tropical shrub. Common names: Headache Tree, Serrated Premna.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Thrives in bright partial sun; avoid prolonged harsh midday direct sunlight to prevent leaf scorch
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Watering Water thoroughly when the top 2–3 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Prefers warm tropical to subtropical temperatures; cannot tolerate frost or temperatures below 10°C
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Characteristics

  • Leaf: Opposite, elliptical to ovate with serrated margins; glossy dark green upper surface
  • Flower: Small, creamy-white, clustered in terminal panicles with a subtle, sweet fragrance
  • Stem/Bark: Woody, grayish-brown bark with smooth texture on young branches
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Care Guide

Watering

Maintain consistent moisture in the growing season; allow topsoil to dry slightly between waterings

Fertilization

Apply diluted balanced organic fertilizer once monthly. Discontinue fertilization in winter when growth slows

Banana peel compost tea:Soak fully composted banana peels in water for 24 hours, dilute 1:20, and use as a root drench to support flowering and foliage health
Pruning
  • Remove dead, damaged, or diseased branches in early spring to promote new growth
  • Thin dense inner foliage to improve airflow and reduce pest risk
  • Shape the shrub to maintain desired form after flowering
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA does not list this species as toxic to cats

Humans: No documented toxic effects for humans per authoritative sources

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Garden Uses & Culture

Culture: N/A

Usage: Traditional medicinal use for headache relief and anti-inflammatory treatments in some Southeast Asian communities