M. citrifolia is a eurytopic species i.e., it is able to withstand a wide range of environmental conditions [47]. This hardy plant can thrive in a variety of soil pH and nutrient content [47]. It can inhabit rocky coasts, sea coasts, open grassland, cliffs, salty tide pools, and even lava flows (Fig. 25) [43][47]. In SIngapore, it is naturalized in secondary forests and back mangroves.