Hmmm.
Our days here have been in the seventies and eighties, nights low forties. No humidity. Even the roses that were evergreen this winter have bean-sized buds on them. Those that had to produce new foliage have not started to bud. Roses planted this spring are between just starting to make leaves and just starting to grow new canes. Real flowers among the newly planted roses must be something like six weeks out, I think. It's certainly not for lack of warm days. It's been in the seventies since March. Sometimes it reaches the low eighties. It's not for lack of sunshine, we've had maybe five cloudy days per month since February. Frosts ceased in mid April. Watering has been generous and it has been daily except for the one day when it rained and we got half an inch of precipitation. Maybe half a pound of Mills Magic apiece in March wasn't enough? Thing is, they look very happy and are growing like I've not seen them grow here. So maybe it's just a matter of patience.
Or perhaps I need to poke them with a stick, metaphorically speaking, of course. On Mythbusters they played heavy metal music for plants and found that they grew better. They like it better than classical or jazz. Not sure this would please the neighbors, though. Or me, for that matter.