In temperate summer climates, if your rose bushes are well-established, they can often go for a week without water if they have a deep root system and are well-mulched. In arid or exceptionally hot climates, you may not be able to go more than a day or two without water.
Do roses need to be watered daily?
As a rough guide, in extremely hot weather you should assume rose plants will need watering daily. On a standard summer day with decent heat, you will need to water every two or three days, and in warm dry weather you will only need to water about once a week.
How can you make roses last longer without water?
Flowers can live for up to five days without water if you wrap the stems in wet paper or cloth. Also, some flowers naturally last longer than others. Hot weather makes flowers die quickly, while cold temperatures sustain the life of the bouquet longer.