What is the recommended humidity level that must be maintained in a cooler for floral storage?

The recommended humidity level for floral storage in a cooler is indeed in the range of 90-95%. High humidity is crucial for maintaining the quality and longevity of cut flowers and foliage. This level of humidity helps to minimize water loss through transpiration, which can lead to wilting and deterioration of the blooms.

When flowers are stored at higher humidity levels, they retain moisture better, therefore staying fresher for a longer period of time. It is important to ensure that the cooler is equipped with proper ventilation and humidity control mechanisms to maintain such levels consistently.

Lower humidity levels, while still offering some moisture, do not provide the optimal conditions needed for many types of flowers, which can result in a higher rate of dehydration and decreased quality over time. Hence, the 90-95% range specifically supports the viability and freshness of floral arrangements during storage.