Ombu Tree (Phytolacca dioica)

Ombu Tree

Phytolacca dioica

Its broad canopy shelters like a living umbrella, a drought-tough evergreen tree; common name: bella sombra.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; tolerates intense heat and prolonged dry periods
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Watering Water deeply but infrequently; allow top 15–20 cm of soil to dry completely between waterings to prevent root rot
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Temperature Hardy to mild frosts; thrives in warm temperate to subtropical climates with minimal cold exposure
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Characteristics

  • Leaf: Large, glossy elliptical leaves up to 30 cm long with bright green foliage
  • Flower: Small, greenish-white fragrant clustered racemes
  • Stem/Bark: Thick, succulent trunk with spongy water-storing tissue for drought tolerance
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Care Guide

Watering

Water deeply every 7–10 days during dry spells to support new growth

Fertilization

Apply diluted balanced liquid fertilizer once monthly to support canopy growth. Use low-concentration fertilizer to avoid damaging the succulent trunk tissue

Composted eggshell powder:Sprinkle a thin layer around the base of the tree; water in lightly to release nutrients gradually without causing soil imbalance
Pruning
  • Remove dead, damaged, or crossing branches in late winter to maintain canopy shape and airflow
  • Thin overcrowded inner branches to improve light penetration to lower foliage
  • Avoid heavy pruning as the succulent trunk heals slowly; limit cuts to small, targeted removals
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion leads to vomiting, diarrhea, abdominal pain, and lethargy

Humans: Contains saponins and oxalates; ingestion causes oral irritation, nausea, vomiting, and diarrhea

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Garden Uses & Culture

Culture: Symbol of resilience in South American rural landscapes; historically used as a shade tree for livestock

Usage: Ornamental shade tree; traditional medicinal uses are discouraged due to high toxicity