USDA zone 5b and warmer. Spring Pruning: Remove old canes and dead or diseased wood and cut back canes that cross. In warmer climates, cut back the remaining canes by about one-third. In colder areas, you'll probably find you'll have to prune a little more than that.
How much water your rose bush will require depends on your soil and weather. A general rule of thumb is to provide roses at least one inch of water each week—this could mean daily waterings, every other day, or even just twice a week.
Roses can be heavy feeders and since miniature roses continue blooming all season, regular fertilizing is essential. Use any commercial rose food or general all-purpose fertilizer, according to label instructions. To keep your plant healthy, be sure to feed it when the bush first leafs-out and after each heavy flush of bloom. Stop feeding your roses about six to eight weeks before the first expected frost to discourage new growth that could be killed back during winter.
As with other roses, you'll want to prune miniature roses just before their new growth starts in late winter or early spring. Hard pruning is not necessary. Simply prune dead or broken wood first, then trim back about one-third of the plant to maintain its shape and encourage new growth.