A Field Gene Bank (FGB) is established for targeted RET medicinal plants at IIHR, Bangalore. FGBs provide an easy and ready access to the plant genetic resources, for characterization, evaluation and utilization, while the same material conserved in the form of seeds, in vitro or cryopreservation must be germinated or regenerated and grown before it can be used. FGB is also useful for conserving vegetatively propagated genotypes that commonly produce variants (genetic variation) since these can be more easily identified and rouged out in the field than in vitro.. Association pattern of abiotic preference and formation of micro habitat or micro ecological niches as found in similar forest area was carefully studied and the same was simulated in FGB. Introduction of species were done carefully considering various factors peculiar to the natural habitats such as ecological situations, associations with other plants and micro organisms, soil characteristics, vegetation type etc so that a symbiotic balance is achieved in each community of plants in a short period of time. In due course the succession process starts in the manmade populations and may end up with natural evolution taking over. The present FGB at IIHR established the following species accessions of RET medicinal plants : Kaempferia galanga11, Kaempferia galanga 8, Holostemma adakodien 4, Oroxylum indicum 9, Embelia ribes 2, Celastrus paniculatus 23, Decalepis hamiltonii 6, Aristolochia tagala 3, Saraca asoca 6, Alpinia galanga19,Kaempferia galang 26,Rauvolfia serpentiana10. The FGB is completely organic in mangement and chemical sprays and fertilisers were avoided.