Yes, you can. I have a couple of clones in my EZ-Cloner 30, which have been there over a month. I took out the other 28 a couple of weeks ago, and those 2 weren't fully rooted, so I left them in there. They've had plenty of roots for awhile now, the last two, but A) I don't really need them; B) I've been too lazy to pot them; and C) I haven't had the heart to kill them. Now I know why I kept them alive: so I could answer your question!