plant a lot of herbs around the smaller plants.. thyme... basil.. rosemary... sage... all are great cover ups and very plesant to smell anyways.... truely for outdoors the autoflower strains seem to do well because of their short stature... you can hide them in with anything that grows over a foot tall... as far as taller plants... thats harder to answer... if you can cover up the smell with flowers and herbs... then plant like a row of tomatoes or something that will grow up a trelace (spelled wrong i know) and creat a "wall" in front of them and around them... sorta of box the taller ones in...