Candlebush (Senna alata)

Candlebush

Senna alata

Its upright flower spikes glow like golden candles, a bold tropical accent. Evergreen shrub; common names: candlebush, empress candle plant.

Full sun
2–3/week
Moderate
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Plant Needs

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Sunlight Thrives in full direct sunlight; tolerates partial shade in extremely hot tropical climates to prevent leaf scorch
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Watering Water thoroughly when the top 2–3 cm of soil dries out; avoid standing water to prevent root rot
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Temperature Prefers warm tropical to subtropical temperatures; protect from frost as temperatures below 10°C can cause leaf damage
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Characteristics

  • Leaf: Large pinnate compound leaves with 8–12 pairs of oblong leaflets; fold at night
  • Flower: Dense upright spikes of bright yellow tubular flowers in tiered whorls
  • Stem: Young green woody stems maturing to brown smooth bark
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Care Guide

Watering

Maintain consistently moist (not soggy) soil; increase watering frequency during prolonged dry spells

Fertilization

Apply diluted balanced liquid fertilizer every 2 weeks. Discontinue fertilization during autumn and winter when growth slows

Banana peel compost tea:Use fully composted banana peels soaked in water for 24 hours, dilute at a 1:20 ratio before applying as a root drench; avoid raw peels to prevent pest infestations and odor
Pruning
  • Deadhead spent flower spikes promptly to encourage continuous blooming through the growing season
  • Prune overgrown or leggy branches in early spring to maintain a compact, upright shape
  • Remove yellowing or damaged leaves regularly to improve airflow and reduce disease risk
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to anthraquinone glycosides; may cause vomiting, diarrhea, abdominal pain, and lethargy

Humans: Ingestion of large quantities may cause gastrointestinal upset including nausea and diarrhea

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Garden Uses & Culture

Culture: Used in traditional tropical medicine to treat fungal skin infections; symbolizes warmth and vibrant energy in garden design

Usage: Ornamental landscape shrub; traditional medicinal applications for skin conditions