I am watching a grow on another site and they have three plants in flower under a "tent". It is built of PVC pipe and covered with a tarp. He is having problems getting the tarp off every day at the same time, but his girls look great so far, they look around three feet. He is using the natural sundown I think, and keeping the tarp on in the morning later than the sunrise.
I considered this last year, the plastic bag thing. Did not do it, for all the good reasons stated above. The heat would have killed my girls at the most and molded them at the least, I beleive.
What is your hurry? or did I miss something?