OK - quick update.
Went out and bought a PH meter today, and the soil seems almost perfect sitting around 6.5.
I lifted a few of the plants today to check their drainage holes and I can see some roots pushing out. I assume my girls are getting root bound and need transplanting, maybe this is whats delaying flowering, what do people think?
I need some more soil and pots before i can do this tho, so il go out and get them tomorrow.
b0urner