The vibrant colors and large size of hydrangea blossoms make them popular in cut arrangements and bouquets. The flower's quality begins to drop as soon as it's removed from the hydrangea shrub, and some wilting or fading of colors is inevitable. Several strategies and procedures can help condition and rehydrate the cut flowers to revive their appearance and keep them looking their best as long as possible.
Pluck off all the leaves on the cut hydrangea's stem. Leaves drain the stem and flower of moisture and energy and can decrease the life of the flower.
Heat water to 100 to 110 degrees Fahrenheit--the optimal temperature for absorption by cut flowers, according to the University of Illinois--and completely immerse the hydrangea in the water. Let the flower soak for two hours. This rehydrates the entire flower, including the stems and petals, and perks up even wilted flowers, according to "Hydrangeas: A Gardener's Guide." Repeat this step whenever the flowers begin to wilt.
Cut the bottom inch off of the hydrangea blossom's stem before inserting it back into a vase full of water. This helps increase the stem's water intake, keeping the blossoms looking fresh. Trim again every two days.
Add cut flower food, available from most florists and some garden stores, to the water in the vase. Such products contain vitamins and minerals that feed the hydrangea, helping to maintain color.
Mist the hydrangea flower's petals throughout the day to help guard against wilt.