The impact of invasive species on ecosystems is a major conservation issue, particularly in fragmented tropical forests due to associated disturbances. In the Western Ghats biodiversity hotspot fragmented rainforests often adjoin coffee plantations. This study in the Anamalai hills assessed invasion by shade-tolerant coffee (Arabica and Robusta) and three light-demanding alien species (Chromolaena odorata, Lantana camara, and Maesopsis eminii).