ABSTRACT
Germination of Rhynchostylis gigantea (Lindl.) Ridl. seeds had been employed
using 7-9 months old pods and cultured on solid media. The highest germination percentage
of Rhynchostylis (score 2.7) had been obtained on VW (1949), media supplemented with 150 ml/l
coconut milk and potato extract 100 g/l. The best media for growth promotion (1.7 times
compared to the starting fresh weight within 9 months) was VW (1949) supplemented with
150 ml/l coconut milk and 1gm/l of orchid fertilizer (formula 21-21-21). The addition of 2-4%
(w/v) of mannitol displayed the best concentrations for slow growth conservation that last for
12 months without changing the media. The plants showed the good performance after
moved to growth promotion media