Throw your seeds out in March. Maybe you'll get lucky, but more likely birds and mice will eat them all.
You get out what you put in.
I put about 1000 hours into my garden, annually.
My return would be worth about $100/hr, if I were selling my buds.
You spend 30 seconds in yours. What do you think you'll get?
(Not trying to be an asshole. Just trying to make the point.)
If you really want to have a garden, there's a lot of experienced stealth growers, here.