need help white dwarf

I plan on growing some white dwarf (first time grow) I will use promix from rona (blue bag) in large pots 2 feet deep. Is this good for outdoor?

what else should I add?

what fertilzer should I use and when?

Where do I find fertilizer?
(home depot,Rona)?

I am in the toronto area. hope you can help

I wouldn't nute until after a Month unless your soil has NO nutes in it. If you can get Fox Farms soil Trio you'll be happy with the results (Try Google). Use 1/4 of the recommended amount and work your way up to decrease the chances of Nute burn.