Which factor has the least impact on outdoor floral arrangements?

Color has the least impact on outdoor floral arrangements due to its primary role in the aesthetic appeal rather than the structural integrity or longevity of the arrangement. While color is crucial for creating visual interest and conveying emotions, it does not directly affect how well flowers will withstand environmental conditions or how they perform outdoors.

In contrast, wind can physically damage arrangements, causing flowers to be blown out of place or breaking stems. Humidity plays a significant role in the hydration levels of the flowers, influencing their freshness and how long they last outdoors. Heat can accelerate wilting and drying out of the flowers, impacting their longevity and appearance. Therefore, while color is important for the visual aspect, it does not influence the practical aspects of maintaining a floral arrangement outdoors as the other factors do.