Tamil Nadu Launches Invasive-Species Eradication Drive: Senna spectabilis

Tamil Nadu has launched one of India’s largest invasive-species eradication initiatives aimed at completely removing Senna spectabilis from all forest divisions by March 2026. The drive targets restoration of forest biodiversity and ecosystem health.

About Senna spectabilis

• What It Is:
  • A fast-growing, yellow-flowering tree from the legume family (Fabaceae). Widely planted as an ornamental or shade tree but now considered a highly invasive alien species in India, Africa, and parts of Asia.
• Origin:
  • Native to South & Central America – Brazil, Argentina, Paraguay, Bolivia, Peru, Venezuela.
    In India, invasive in Nilgiris, Mudumalai, Sathyamangalam, Anaikatty, and other Western Ghats ecosystems.
• Habitat:
  • Thrives in dry to moist deciduous forests, disturbed woodlands, and savannahs.
    Prefers full sunlight, adapts to poor soils, and spreads easily through prolific seeds.
• Key Characteristics:
  • Height: 7–18 m, forming dense canopies
  • Bright yellow flowers and long pods (15–30 cm) with hard-coated seeds
  • Leaves exhibit nyctinasty – close at night, open at dawn
  • Traditionally used for fuelwood, shade, ornamental planting, and small implements
  • IUCN Status: Least Concern

Ecological Implications

• Forms dense monocultures, suppressing native vegetation and reducing biodiversity.
• Reduces fodder availability for elephants, deer, and herbivores, impacting wildlife movement.
• Increases forest fire risk due to accumulation of dry biomass.
• Delays natural forest regeneration, threatening long-term ecosystem resilience.