The artificial establishment and natural regeneration of mangroves at Sungei Api-Api, a man-made estuarine channel on the north eastern coast of Singapore, is examined. Several environmental factors affecting mangrove growth are briefly detailed, including: (i) slope gradients, (ii) salinity and tidal inundation levels, (iii) substrate type, and other factors such as tidal currents and propagule establishment. An analysis of the environmental factors affecting Sungei Api-Api mangrove growth indicates that successful growth is attained where: (i) fully saline, tidal inundation occurs over low slopes and (ii) the substrate comprises fine sediments. The artificial establishment of mangroves in a man-made channel is shown to be moderately successful in this area. The Sungei Api-Api trial project provides an excellent example of a potentially significant method by which mangroves can be conserved and reintroduced in urban and near urban tropical environments.