Flowers should be stored in a refrigerator that is between 34 and 36 degrees Fahrenheit to reduce water loss. The appliance's relative humidity should be about 90 percent. Flowers must not be placed near fruit, which produces ethylene gas that causes blossoms to wilt.
Flowers stored in a refrigerator should be taken out for about 90 minutes a day, because the warmer room temperatures encourage water uptake. Flowers that aren't stored in a refrigerator should be placed in the coolest location available, away from air vents and heat sources such as radiators and televisions. Excessive heat causes flowers to lose water and open prematurely.