How can I encourage my hydrangeas to bloom next year?
they haven't bloomed for the past two years, but for a blossom or two.
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If you live in a cold area, you need to protect them from the cold. In the spring when they start to grow, they must be protected if there is a big freeze coming. You will need to cover them with a sheet and be sure to remove it before the sun comes up in the morning. Mine got killed last spring, because I did't cover them when a freeze came. The year before, they were just loaded with big blooms. Watch the weather in the spring and protect them.
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Why Isn't My Hydrangea Blooming? // Garden Answer - YouTube
https://www.youtube.com/watch?v=QgGcg5uvAyI