Might win an award for the smallest, most underdeveloped plant ever....don't get me wrong I couldn't keep a huge bush, but this is ridiculous. Im so sure its the smart pots doing their job, just a bit too well with air trimming of the roots.
I was very tempted to abandon this one and start again with some proper pots, but i feel like I've gone too far and as she's started to flower I might as well waste another 8 weeks.
They are growing slow as you say...i would suggest you to rise a bit the temp expecialy during night time ( roughly 19°C)...and double check if they are in an under/over watering situation...are you giving them some nutrient feed?
@jackjack, Ok i'll see what I can do with the temperature at night.
I don't believe I'm watering badly but watering and nutrients seem to be an issue for me that I can never get right, so I'm abstaining from nutrients at the moment.