Champagne roses can generally live for 7- 15 days if they are cultured in water, because only one branch supports the opening of flowers, and the nutrients in the branch will die after being consumed. If it is not immersed in water for maintenance, it is likely to die in a few hours. If you want it to survive for a long time, you need to change the water frequently, and add a small amount of nutrient solution to the water after each change.