Answer: This hydrangea is special in that it is able to bloom on both old wood that grew the year before, and also on the new growth of the season. In your area, it is likely that the old wood or previous year's growth will be killed back to the ground each winter. This means your plant would not bloom at the normal midsummer time on the old wood. Instead, it would be expected to bloom later in the season on the new growth of the season. Its ability to do this however will depend on how well it has thrived during the current year. With a new plant, you may see it devote most of its energy the first year to becoming rooted and established and this could cause a reduction in blooms. To perform its best it also needs to be planted in a location with direct morning sun or very bright dappled light all day (in too much shade it will not bloom), soil that is kept evenly moist (meaning damp like a wrung out sponge, not sopping wet but never dried out) and well fertilized. If any of these are lacking it may not bloom very well. Also, pruning during the growing season would remove flowering branches. I hope this helps you trouble shoot -- and I hope it blooms nicely next summer.
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