I have a question? If I had outdoor plants that were 9 feet tall and I wanted to make them bud could I just throw a black plastic bag over them in the evening to adjust the daylight to 12/12. Would this work, or will it screw them up?? It would obviously be for about 3 hours a day to compensate for the extra day light. Any ideas on this would be greatly appreciated. Thank you.
9 feet tall? WHOA...lol...
...as for the plastic bag idea...personally i wouldnt. it would seem to me that that would perhaps promote either mould, bugs, rot, etc.
As much as i appreciate you wanting to start em flowering, an outdoor grow, with plants that tall would best be left to nature. But you raise a good point...and this is why i prefer a nice indoor hydro gro...i have TOTAL control over the growth cycle. you may want to try growing indoors, then transplanting late summer and let nature finish up.
Best of luck!