Greenhouse-grown hydrangeas often hold their blooms for weeks indoors. Don't let your potted hydrangea completely dry out, and keep it in a cool, bright room, out of direct sun. After the last frost in spring, move your hydrangea outdoors to a shady spot for a week or two. Then gradually give it some morning sun, to help ease its transition. Finally, plant it in a location that gets morning sun (unless you have a variety that's labeled with different sun or shade requirements). Hydrangeas should be kept watered and mulched as the weather warms up. it may take them a year or two to start blooming again at the normal time of year. Gardeners in cold winter regions sometimes lose their flower buds to late cold snaps.
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