Plants of three months from explant (Murashige and Skoog 1/3 with 2% sucrose). I still have a strange and and inexplicable fall of pH in the substrate after one day, but I'm handling it with an increase during preparation.
44259766_10217235400138049_1776835211670061056_n.jpg (53.58 KiB) Viewed 414 times
44129373_10217235401498083_5731464995577790464_n.jpg (52.1 KiB) Viewed 414 times
44232913_10217235400778065_7902460033290469376_n.jpg (55.83 KiB) Viewed 414 times
44318038_10217235402138099_8624038539295719424_n.jpg (55.23 KiB) Viewed 414 times
Simply autoclaving media is sufficient to reduce the pH, through hydrolysis, among other some things; and virtually all media -- especially within the pH associated with the culture of carnivorous plants and orchids -- will become more acidic.
You may wish to increase your sucrose concentration, to 2.5, even 3%. I've rarely achieved or maintained stable pH at concentrations that low . . .