Which factor is crucial for the longevity of cut flowers in arrangements?

Proper hydration and care practices are essential for the longevity of cut flowers in arrangements. Flowers require water not only to maintain their structural integrity but also to facilitate nutrient absorption. Adequate water supply helps to prevent wilting, allows for continued metabolic functions, and sustains the flowers' vibrant appearance.

In addition to hydration, care practices such as trimming the stems at an angle, using clean vases, and changing the water regularly contribute significantly to prolonging the life of cut flowers. These practices help to keep stems fresh and free from bacterial buildup, which can block water uptake.

The other options, while they touch on important aspects of flower care, do not encompass the combination of factors necessary for optimal longevity. Sunlight exposure may not always be beneficial for cut flowers, as direct sunlight can cause them to dehydrate more quickly. Exclusively using artificial preservatives may not address the need for hydration in the same way that water and proper care can. Limiting air circulation might actually promote the growth of mold and mildew, which can suffocate the flowers instead of aiding their longevity.