Sure. I mean, you're probably going to want to fertilize the soil a bit since roses are pretty heavy feeders for flowers and I'd try to plant something that isn't anywhere near roses genetically to avoid the scourge of any pathogens that might have concentrated in the area over time. Practically speaking, the way I would approach it is dig up the roses, if you haven't already. Dump a bunch of organic fertilizer according to package instructions on the soil (I like Job's). I'd probably pour in some extra soil inoculants like Real Grower's Recharge, some liquid kelp and some compost tea or just straight compost if you have it on hand, and then till the hell out of the soil until it's nicely mixed. If you really want to go all out dump about 100 red wigglers on your new soil too. May be throw in a little perlite for drainage and aeration if it seems heavy. Then I'd let that sit for a month and then plant whatever. Should grow pretty well if it's good sun.