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‘Pink Blooms’ in Kole wetlands of Kerala

  • Category
    Ecology and Environment
  • Published
    29th Sep, 2023


Kole wetlands, an internationally important Ramsar site of high value biodiversity, have been facing the threat of alien invasive species called ‘Pink Blooms’.

About Pink Bloom:

  • Cabomba furcuta, popularly called as Pink Bloom due its massive flowering, is a invasive species in Kole wetland waters.
  • Cabomba furcuta was brought to Kerala as an aquarium plant and has escaped to the wild.
  • The species is native of central and South America.


  • Cabomba, which requires a large quantity of oxygen for its growth will choke water bodies and drainage canals.
  • It could also spread out to the paddy fields as seeds quickly spread into them.
  • According to a survey done as part of the Asian Waterbird Census (AWC) 2023, some migratory waterbird species, particularly duck species that visit Kerala's Alappuzha region, are experiencing declining populations due to increasing invasive species.

Other invasive species emerging in the wetland are water hyacinth and Salvinia molesta.

Kole Wetland

  • Kole Wetland is located in Kerala.
  • It is one of the Ramsar Sites.
  • It is the largest brackish, humid tropical wetland ecosystem located in the state of Kerala.
  • Extending from the northern bank of Chalakudy River in the south to the southern bank of Bharathapuzha River in the north.
  • It is situated in the Central Asian Flyway of migratory birds.


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