watering B little stars

[brit6v]

Hi everyone,
I bought a B little stars yesterday afternoon and mounted it this afternoon. I plan to hang it from the peak of my greenhouse roof, where it will get the most light. I'm unclear as to how to water it, though.....should I only mist the roots, dunk it in a bucket of water....?? Also, how often would you suggest? Could someone advise me, please?
Vicki
(By the way, please don't judge my mounting job...I know it leaves quite a bit to be desired).