Yerba Mate (Ilex paraguariensis)

Yerba Mate

Ilex paraguariensis

Its evergreen leaves brew a caffeinated infusion with earthy depth. Evergreen shrub or small tree; common name: yerba mate.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Full to partial sun; tolerate light shade, but optimal growth requires 6–8 hours of direct sunlight daily; protect from intense midday summer sun in hot regions.
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Watering Keep soil consistently moist but not waterlogged; allow the top 2 cm of soil to dry slightly between waterings to prevent root rot.
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Temperature Thrives in 15–25°C; can tolerate brief light frosts down to 5°C, but avoid prolonged exposure to temperatures below 10°C.
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Characteristics

  • Leaf: Glossy leathery elliptical leaves with serrated margins; dark green upper surface, pale green underside.
  • Flower: Small, fragrant white flowers in axillary clusters; dioecious (separate male and female plants).
  • Stem/Bark: Slender branching stems with smooth light brown young bark; becomes rough and fissured with age.
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Care Guide

Watering

Keep soil evenly moist; water when the top 2 cm of soil feels dry

Fertilization

Feed every 2 weeks with diluted balanced liquid fertilizer. Discontinue fertilization in autumn and winter to support dormancy.

Banana peel compost tea:Use fully composted banana peels soaked in water for 24 hours; dilute 1:20 for root drenching to avoid pest infestations and odor.
Pruning
  • Prune in late winter to maintain desired shape and remove dead or diseased branches.
  • Trim to encourage bushy growth for leaf harvest; cut back overgrown stems to promote new foliage.
  • Thin overcrowded branches to improve airflow and light penetration.
  • Remove suckers to prevent overcrowding and focus growth on the main plant.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-listed toxic; ingestion may cause vomiting, diarrhea, lethargy, tremors, or elevated heart rate.

Humans: Contains caffeine and saponins; moderate brewed consumption is safe, but large unregulated ingestion may cause jitteriness, nausea, or insomnia.

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Garden Uses & Culture

Culture: Traditional social and medicinal beverage in South America; symbol of hospitality in Paraguayan and Argentine communities.

Usage: Dried leaves are brewed into mate tea; ornamental landscape shrub in subtropical gardens.