Answer: Hydrangeas don't make very happy houseplants. They require a resting period in order to thrive, where temperatures should be around 45F. Adventurous gardeners can try to keep their hydrangeas going from year to year by simulating the changes of season they would experience in nature. There are several steps to this process. After they have finished blooming, cut each branch back several inches. As soon as possible, move the plant outdoors into an area where it will receive lots of light but no direct afternoon sun. Fertilize it every few weeks through late summer. While the plant cannot tolerate heavy frost, it is best that it stay outdoors as long as possible. Try protecting it from the first light frost or two (by covering it or moving it in temporarily) so that it can stay out a few weeks longer. When a hard frost is eminent, move the hydrangea indoors to a very cool location, gradually increasing the warmth over the next month or two. With luck, the plant will have set buds during the cool weather outdoors and proceed to bloom.
Hope this answers all your questions!
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