Popcorn Cassia (Senna didymobotrya)

Popcorn Cassia

Senna didymobotrya

Its blooms smell fresh like buttered popcorn, a fragrant tropical shrub. Flowering ornamental; common name: peanut butter cassia.

Full sun
1–2/week
Moderate
🌱

Plant Needs

☀️
Sunlight Needs at least 6 hours of direct sunlight daily for abundant flowering; tolerate partial shade in extreme heat
💧
Watering Water thoroughly when the top 2–3 cm of soil feels dry; avoid overwatering to prevent root rot
🌡️
Temperature Thrives in 20–30℃; protect from frost, maintain temperatures above 10℃ during winter
🔍

Characteristics

  • Leaf: Pinnately compound leaves with 6–12 pairs of oval, glossy green leaflets that fold at night
  • Flower: Dense upright yellow racemes emitting a distinct popcorn-like fragrance when in bloom
  • Stem: Woody branching stems with light brown, slightly fissured bark as it matures
🛠️

Care Guide

Watering

Keep soil consistently moist but not waterlogged

Fertilization

Apply diluted balanced fertilizer every 2 weeks. Discontinue fertilization during winter dormancy to avoid nutrient buildup

Banana peel tea:Steep fully composted banana peels in water for 3 days, dilute 1:10 for root drench; avoid undiluted application to prevent root burn
Pruning
  • Deadhead spent flower racemes to encourage additional late-season blooms
  • Prune back leggy stems in early spring to maintain a compact, bushy shape
  • Remove damaged or diseased foliage promptly to reduce pest and disease risk
⚠️

Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion may cause vomiting, diarrhea, abdominal pain, lethargy, and loss of appetite

Humans: Contains anthraquinones; ingestion of large amounts may cause nausea, diarrhea, and stomach cramps

📖

Garden Uses & Culture

Culture: N/A

Usage: Ornamental garden shrub for fragrant displays; cut flowers for indoor botanical arrangements