well, i'm planning to keep mine in small pot not larger then 6" (it's in 4" now and for a year at least!).
that should curb the spread :)..
i was browsing for some more info and one site said they should be kept above 68F or they suffer.
mine is indoors always, so no problem, but i'll move it from the window sill in winter then.
i'd like to get a fruit of course, but some site said it might take 7 yrs
though normally broms flower in 2-3. so, i guess we'll see