I was suppose to get Annabelle Hydrangeas but only 3 out of 6 are Annabelles. The others are flat, not so attractive blooms

Question

Can you tell me what kind of hydrangea this is?

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Answer 1

It looks like an Annabelle that has not flowered completely, or is not flowering properly.

Annabelle's have somewhat flat blooms compared to some of the other species.

Perhaps they are receiving more sun than their nearby relatives? They need quite a bit of shade to flower at their best.

If they are in a different location as the others, then I would have your soil tested.

These articles will help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/growing-hydrangeas-hydrangea-care-guide.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm

https://www.gardeningknowhow.com/.../hydrangea/prune-hydrangea-bushes- hydrangea-pruning-instructions.htm

https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/fertilizing-hydrangeas.htm