Yeh put them outside somewere stelth were no one can find them and bury the stem down a bit.Look if you do that get some soil and dig out a patch somewere and if you feed them right they will grow you are just going to lose them there and if they do flower they wont produce anything plus you say you cant hang a light cause your parents might get suspicios then i presume they dont know so its not fair putting them at risk ESPECIALLY with it in the window.Sorry if im being a kiljoy but you shouldnt be growing in someones house without their permision it silly and could lead to all sorts of problems for your parents.Go find a outdoor patch and do it right you will thank me at harvest time.best of luck the postman.