Which factor is most critical for ensuring cut flowers last longer?

The critical factor for ensuring cut flowers last longer is the temperature at which they are kept. Temperature significantly influences the longevity of cut flowers because it affects their respiration rate and the overall metabolic processes occurring in the stems and petals.

Warmer temperatures typically accelerate these processes, leading to quicker wilting and decay. Conversely, keeping cut flowers in cooler environments slows down their metabolism, allowing them to remain vibrant and fresh for a more extended period. This principle is especially important for delicate blooms, which can be particularly sensitive to heat.

While the other factors, such as color, size of the arrangement, and type of vase, have their importance in the overall aesthetic and arrangement style, they do not directly impact the longevity of the flowers in the same critical manner as temperature does.