18 November -- Like missing teeth, the conspicuous gaps of treeless patches along the stretch of the South Luzon Expressway (SLEX) is what a unique tree planting project wants to fill in with aesthetically pleasing trees like Golden Shower (Cassia fistula), Palawan Cherry (Prunus javanica), Balitbitan (Cynometra ramiflora) and Caballero (Caesalpinia pulcherrima).