What kind of roses? And do you get Japanese beetles there? They can eat a whole bush in a day if there are enough of them. When was the last time you fed them the Miracle Grow, and do you use a long acting fertilizer, too? Do they normally bloom this time of year? If not, you may not be able to force them. And you don't want to burn them with too much fertilizer. Sometimes a "tonic" of compost tea can help if it's too soon to fertilize again. And a lot of the folks at Daves Garden Web swear by alfalfa meal for roses. I've not had luck obtaining that, though I haven't tried an actual feed store. But they make an alfalfa tea with it, and they swear by the results.

Good luck.

gg