Opium is from poppys. I've heard it's not real efficient, something like 20 plants for a usable amount.
Blazzin9 is right, you need a considerable amount of plants to yield anything substantial. They're pretty easy to grow, though.
It seems pretty easy, just from googling it..i'd say if your willing to plant enough and take the time it doesn't seem any harder then making hash. -Yeah I wouldn't recommend growing a field, but if you've got somewhere discret at your place you can grow a decent amount for a personal stash it shouldn't be hard..but considering it's illegal a field wouldn't be a good idea.
lol yes u are both probobly rite about a field... i was kinda hopin for a closet or spair room op if i were to attempt it