I have 3 Cherry Wine plants that aren't flowering yet either (and a bunch more that are well along--go figure). On the other hand my Chinook Haze, a sativa dominant from Greenpoint that didn't show anything until September last year, has some nice looking budlets now.
Not sure sure what's going on exactly. Genetic variation seems to have something to do with it, since all the Cherry Wines were started at the same time and cared for in the same way. Does make me nervous having plants just getting started at this point, but then again I was able to harvest that late Chinook last year a few days before Halloween. But gets awfully dicey--was lucky there because that particular strain seems to be highly resistant to bud rot.
Don't sweat it and don't force it. You aren't feeding it N at this point, are you? That can delay flowering (a little N OK early in flower, but too much not good). Also, I'm trying a trick I read from Coot where you topdress with ground up malted barley, he swears it speeds up bud ripening by as much as a couple weeks! Be great if true, time will tell. Might be worth a shot for you. For PM I'd recommend foliar spray of potassium bicarbonate.