how much light is it getting? there is some fluctuation. normal is 18/6. flowering is 12/12. so then you have about 2 safe hours of play there. probably even 4 hours of available light difference there that wont put it into flowering. ive never tested it but thats my guess. so use my answer as a back up haha.
i once planted some plants on the edge of a bush, but they didnt get much light and i ended up getting only about 5 grams per plant, i was only 17 of course and just planted them there, never really went there to check on them for fear of being busted. just wanted to grow some weed.