you could put tem all in there but the only thing youd have to watch is any hemp pollen cos that will cause you problems. you can plant them with anything almost ass long as it dont steal all the light and what not.. they shouldnt cross breed with plants of a completely diffrent type..
tomacco yeah youd be rich lol .. hemp as i said may cross polinate and turn your shit to crap not really sure never really grown hemp.. its the same kinda so i expect ot will fuck your plants up and make them lose thc.
also to answer the thread starters question again
you should be able to work out some kinda idea where the different flowering times end up being all good