Feeding hydrangea's

I have a endless summer that I planted last fall & it is growing well, has lots of green foliage , but only 2 flower buds are forming. I live in Montana & it’s been in the 90’s & above for the last 3 weeks. I water daily and the plant receives morning sun & very little afternoon sun. Is it normal for the plant to only start out with a few flower buds and also can I feed it Schultz plant food 10-54-10 to encourage more blooms? I did fertilize early in the spring with a all purpose fertilizer.
Thanks,
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