Answer: You must be referring to Hydrangea arborescens ("hills of snow"); it is rated hardy to zone 3 and grows to a height of 3-5 feet. This variety forms flower buds on new wood, and therefore you'll get flowers each year. There are other varieties of hydrangeas that will survive in zone 5, dying down to the ground each winter, then resprouting from the crown in the spring. Unfortunately, these varieties form flower buds on year-old wood, so you wouldn't get any flowers in your area.
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