Using C14 as a tracer, the transport and partitioning of photoassimilates in tropical orchids were studied. Plants materials used included both monopodial and sympodial orchid. Our results show tropical CAM and C 3 orchids have an highly integrated pattern of transport and partitioning with inflorescence as a major sink. It is also sourced limited. This integrated pattern of transport and partitioning provides possible ways for enhancing the growth and development of these orchids. Some of these strategies for enhancing growth and development are discussed. This included increasing sink demand and increasing the source supply. Our experiments show that carbon dioxide enrichment (CE) provided the best strategy of enhancing growth and development. The increase in source supply is a result of increase in photosynthesis with a concomitant increase in sucrose and starch formation. The physiological and molecular aspect of carbon dioxide enrichment of tropical orchids will be reviewed. The feasibility of large scale cultivation of orchids under carbon dioxide enrichment will also be discussed.