Why is precooling of cut flowers encouraged?

• A. To reduce bacterial growth
• B. To preserve color
• C. To reduce wilt
• D. To increase postharvest longevity

Answer: (D)

Lowering the temperature of cut flowers soon after harvest slows their metabolic rate, which slows respiration, water loss, and aging processes. By cooling quickly, the tissues use energy more slowly, ethylene production is delayed, and tissues stay turgid longer, all of which extends vase life. This is why precooling is encouraged—to increase postharvest longevity. Cooler conditions can also help limit microbial growth and help preserve color, but the primary benefit is delaying senescence and keeping flowers fresh longer.