large number of the intended plants plb must be propagated for this in order to facilitate the re differentiation of plb into plants the culture environment for the propagation of plb which includes for example the degree of lighting and that of aeration must be kept all the time constant in the present invention plb as induced from root tip of a phalaenopsis orchid are cultivated in a propagation medium and thereafter said plb are re differentiated in a re differentiation medium to obtain plants of said phalaenopsis orchid the plb propagation medium for use in the present invention may be any ordinary medium that is generally used for ordinary propagation of plb concretely it may include for example ms media preferred are tanaka 39 s v amp w modified media m tanaka 1987 studies on the clonal propagation of phalaenopsis through in vitro culture memoirs of faculty of agriculture kagawa university no 49 1 85 regarding the conditions for propagating plb plb may be cultivated and propagated at from 20 u00b0 to 28 u00b0 c preferably from 23 u00b0 to 26 u00b0 c while being exposed to light at an illuminance of from 200 to 10000 lux preferably 2000 lux for from 8 to 24.