African Cassia (Cassia sieberiana)

African Cassia

Cassia sieberiana

Golden blooms flood the canopy like sunlight woven into clusters. Deciduous flowering tree; common names: African Cassia, Sieber's Cassia.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires full sun exposure for abundant flowering; tolerates partial shade but produces fewer blooms
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Watering Water deeply but infrequently; allow the top 20 cm of soil to dry completely between waterings to prevent root rot
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Temperature Thrives in warm tropical and temperate climates; cannot tolerate frost or temperatures below 10°C
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Characteristics

  • Leaf: Pinnately compound, 15–30 cm long; oval bright green leaflets that fold at night
  • Flower: Dense terminal clusters of bright golden-yellow, five-petaled blooms
  • Stem/Bark: Grey-brown rough fissured bark on mature trunks; smooth green young stems
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Care Guide

Watering

Increase watering frequency during active growth and flowering to maintain consistent soil moisture

Fertilization

Apply a balanced slow-release fertilizer once at the start of growth. Avoid high-nitrogen fertilizers, as they prioritize leaf growth over flower production

Composted banana peel tea:Soak fully composted banana peels in water for 24 hours; dilute the mixture 1:20 before applying as a root drench to avoid nutrient burn
Pruning
  • Remove dead, diseased, or damaged branches in late winter before new growth emerges
  • Thin overcrowded inner branches to improve airflow and light penetration throughout the canopy
  • Trim to maintain a desired canopy shape; avoid heavy pruning as it may reduce subsequent flowering
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

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

Humans: Contains anthraquinone glycosides; ingestion of large quantities may cause gastrointestinal upset

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Garden Uses & Culture

Culture: Symbolizes resilience and seasonal abundance in traditional West African cultural practices

Usage: Ornamental shade tree; wood used for small craft projects; bark has limited traditional medicinal applications