Answer: Without knowing what type of hydrangea you have it is a bit difficult to make a guess as to the cause of the problem. However, the macrophylla types (which are the most common) bloom on the previous year's wood, so certainly your trimming would have caused the plant to skip a summer's bloom in 1997. A harshly cold or windy winter could kill it back enough to prevent blooming during the coming season, and overly lush or succulent growth (especially if the plant has been oversupplied with nitrogen during the season) is more subject to that type of damage. Finally, late spring freezes can also kill the newly emerging growth and prevent blooming for a year. I hope this helps you figure out what has been going wrong. I hope your plant blooms this year!
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