How long will roses last in the cold?

For Valentine's, I want to surprise my fiancee by leaving a rose in her car while she is at work. The temperature is supposed to be -12C (10F). If she leaves work at 3:30, what is the earliest I can leave the rose in her car and have it still last?

How long will roses last in the cold?
I'd find another way to get it to her...I don't think flowers last in the cold for very long at all. They're fragile. Maybe you could get it delivered to her?
Reply:At that temperature, I would not leave it for more than 1/2 an hour, if the temperature in the car is that low it will freeze quickly. Try to put it in a box or something that will hold the temperature a little bit longer. Wrap the stem in a moist paper towel, the humidity will also help to prevent it from freezing. However, even if it freezes, it is a beautiful gesture and she will love it.
Reply:certainly a lot longer than they will last in the hear, flowers seem to thrive in the cold, this is why most of the experts advise you place the flowers into cold water prior to putting them into a vase.





cheers