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Endless Summer hydrangea problem

I bought the "Endless Summer" hydrangea three years ago. The first year it bloomed, but last year and this year it hasn't, just has leaves. We live in Minnesota, zone 3 and 4, I think. How can I get the plant to bloom?
Submitted by BHGPhotoContest

There are a few simple things you can do to encourage your Hydrangea to bloom. In a northern climate like yours, Endless Summer Hydrangea needs to be in part sun. Six hours of morning sun followed by some light afternoon shade is ideal; too much shade all day will inhibit bloom production. Fertilize your Hydrangea once per year in spring with a slow-release granular fertilizer. Look for a formulation high in phosphorous; 10-30-10 or something similar. Finally, mulch your Hydrangea in winter to protect the tender buds that emerge in spring from a late freeze.

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