The government says, YES YOU CAN!
Four plants per household, but wait...
You can only do so with OCS purchased seeds!
Then lets buy OCS seeds, but wait...
OCS seeds are not currently available or in very limited amount and variety.
Growing your own cannabis(https://www.ontario.ca/page/cannabis-laws#section-4)
You may grow up to four cannabis plants per residence (not per person) if:
Cannabis news and information about breeding, events, extraction, history, and tourism in Ontario Canada.