Follow the general care guidelines described here, being sure to remove any discolored petals on the flower’s outer edge (called guard petals) and foliage that fall below the waterline when refreshing your arrangement. Recutting the stems often will give your roses the longest vase life.
If your roses begin to wilt, you may be able to revive them. Trim off about an inch from the bottom of its stem and then submerge the entire rose under water in a sink or bathtub. Allow the stem to absorb water for about 20-60 minutes before returning them to their vase.
Roses last longer in a cool area, but if you want their blooms to open quickly, temporarily place them in a warmer spot (Note: not hotter than 80 degrees Fahrenheit).