Answer: If you are simply going to transplant to a larger pot you can do so with a flower bud forming and it should not bother the flower at all. Here's how: choose a container with adequate drainage holes; moisten potting soil and place some in the bottom of the container. Set the original container into the new one to see how much more potting soil you will need to add so that the plant's rootmass will fit into a well that you make in the new potting soil. Once you are satisfied that the root mass will set on the new potting soil with the plant at the right level in the new pot, unpot your hydrangea. The easiest way to do this is to use a long knife to cut around the potting soil on the inside of the pot. Then lay the pot on its side and slide the hydrangea out of the pot and immediately place it on the soil in the new container. Fill around the sides with additional moistened potting soil, tamping it down gently. Then water the plant to help settle the soil. The process will be so fast that your hydrangea won't even know it's been repotted. Place it in the same spot as it was growing before and it should continue to grow and bloom without any other special treatment. Best wishes with your plant!
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