Reviving Grammatophyllum Scriptum

[tarev]

This Grammatophyllum Scriptum "Hihimanu" never bloomed since I got it last Feb 2010, and it gradually declined, from 3 healthy bulbs, down to one, and now the last one has really started to decay, but it did manage to send out a good shoot with thriving leaves. It has since been repotted to just hydroton media. I was thinking of removing the decaying pseudobulb, but I read somewhere that the plants sometimes still draw energy from it. Should I just let the plant do its thing in gradually decaying that old pseudobulb? Initially, it was potted in bark medium, then I moved it to a semi-hydro set-up then, I just kept it in just hydroton no semi-hydro set-up.