Withered roses can temporarily be revived by dissolving an aspirin in the water.
How to treat roses?
If you do not want the cups hang too fast you can cut the best the mandrels, as far as possible down the stem leaf, steal at the bottom quite cut diagonally and put in water in which you have solved a little sugar. Roses do not like warm / hot water, so frequent cold, fresh water into the vase.
Put roses in vases sanitized with chlorine and rinsed with water. Roses with feed or drop of chlorine in hot water put this brings the juice stream going again, in this way, the roses are the best. Hanging heads means that the sap so the moisture absorption is not good enough, this is for example, by draft or in the sun in front of flowers. Flower evaporates more moisture if he receives.