Scarlet Sesban (Sesbania punicea)

Scarlet Sesban

Sesbania punicea

Its fiery red blooms hang like tiny lanterns, brightening warm-season gardens. Deciduous flowering shrub; common names: scarlet sesban, rattlebox.

Full sun
1–2/week
Moderate
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Plant Needs

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Sunlight Requires full sun to partial shade; thrives with 6+ hours of direct daily sunlight for optimal flowering
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Watering Water deeply when the top 2–3 cm of soil feels dry; avoid overwatering to prevent root rot
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Temperature Tolerates warm, tropical to subtropical temperatures; protect from frost below 10°C to prevent dieback
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Characteristics

  • Leaf: Pinnately compound leaves with 10–20 pairs of oval, bright green leaflets
  • Flower: Pendulous clusters of tubular scarlet-red blooms with yellow throats
  • Stem: Slender, green to brown stems with smooth bark; woody with age
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Care Guide

Watering

Keep soil consistently moist but not waterlogged to support active growth and flowering

Fertilization

Feed with diluted balanced fertilizer every 2 weeks. Avoid over-fertilizing, as excessive nitrogen can reduce flower production

Composted banana peel tea:Compost banana peels for 2–3 weeks, steep in water for 24 hours, dilute 1:20 with water, and apply as a root drench to promote blooming
Pruning
  • Prune immediately after flowering to maintain a compact shape and encourage new growth for the next season
  • Remove dead, damaged, or diseased branches to improve airflow and reduce pest risk
  • Thin overcrowded stems to allow better light penetration to inner foliage
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic due to sesbanimide; 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: N/A

Usage: Ornamental garden shrub; attracts hummingbirds and pollinating bees