so that would be a rpg style a lil bit like the sims or harvest moon.. but u have a pot farm.. where u plant seeds and water em with a dark swarm... with a whole city where u can buy seeds, buy plant, sell weed, etc.. their would be more than 1 type of weed, each with their own caracteristics (time, value, cost, etc..) and those depends on wat season it is (not really season but.. random switches) just like harvest moon, u'll need tool to use ur ground.. u change tool by building different units with a certain building.. to water the crops u'll need the defiler and to colect weed u need scv (sumthing like that) so if u got more idea.. i need those.. thank you!
Why does it have to be pot?

Why can't it be some other plant? Some people's moms don't want their kids playing games where you farm pot.
But I'm surprised no one thought of the watering thing, they usually have plants be zerg buildings that you upgrade. Then you just leave it alone until it's full grown.