hey does just any type of poppy seed produce the opium or only special type?if you like to trip on mescaline like me you could through some cactus in there...or some opium poppies... they will all do well in a green house
edit...
and i also love orchids but you will need to have them in somwhat of a shady spot of the green house.
how do you grow your geranium, from seed or from seddlings?a rose scented geranium is an awsome plant it spells great and keeps bugs away.
i keep one every year and it keeps mosquitos away you just rub a leaf lightly on your clothes
and they wont bother you