Answer: If not pruned regularly, your hydrangea will become very 'leggy', growing upwards until the weight of the stems is greater than their strength, at which point the stems will sag down to the ground and break. Your goal is to prune the shrub back each year so it remains compact and the shorter stems it produces will be sturdier. Wait until flowering has finished to prune, or prune very early in the spring, just as new growth begins. I think that will solve the problem. Enjoy your beautiful shrub!
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