I've got some plants outside in a homemade greenhouse...the next couple nights will be the acid test, because its been like summer all year! anything I put outside before april 20, go into flowering, so anything flowered middle of march or later has to go into 'the bag'(blackout to fix light hours) from late april 'til late july, to finish...after that they just flower regardless. they may not grow like summer, but something's better than nothing; and you can get an enormous jump on summer!!!