Answer: When to cut depends on which type of hydrangea you are growing. Recommendations for commercial growers say to cut the H. macrophylla blossoms when fully open but to cut other types when half the florets are open. After care can influence vase life as well. Some commercial handling recommendations include steps such as searing the cut end of the stem, or plunging into cold acidic water (pH 4.0) for twelve hours. Certainly keeping them cool and out of direct sun will help them last longer in the vase, as can using a commercial floral life extender in the vase water. You may want to experiment and see what works best for you.
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