Blueberries Didn't Fruit

Spring of 2015 I bought blueberries in a pot that fruited decent.  I bought these from a box store.  Fall of 2015 I transplanted them into the ground.  They are on the eastern side of a fence.  

They didn't fruit this year.  I got some flowers but they shriveled up with no juicy treats to be had.

Did I transplant them at the wrong time?  Do I need to use more  pine mulch?

I'm in eastern Washington state, zone 5b.

I want to eat blueberries!  They tasted like candy.  I miss them.  

Howdy Vicki , welcome to permies!
Do you remember if you had any bad weather, frost, hard rain, hail etc that might have damaged the flowers ?
Perhaps the plant is still getting settled in, it might do better next year? Is the rest of the plant healthy?
What PH is your soil generally?

I had been wanting to grow blueberries for several years but thought they were too difficult after reading up on the subject. I received one as a gift but it didn't like our soil.  Here is a comment from "yahoo answers":

Fertilizing you're soil is basically a must, and keep in mind that you most likely won't harvest any blueberries for the first three years.

And this is from Mother Earth News:

Blueberries are only marginally self-fertile, so you’ll need to grow at least three plants of compatible varieties.

Most soils should be amended with 4 inches of acidic organic matter, such as rotted sawdust or leaf compost.

If your soil’s natural pH ranges between 5.5 and 6.0, you can further acidify it by top-dressing with soil sulfur twice a year. In areas with soil pH levels above 6.0, grow blueberries in large containers filled with a wood chip- or bark-based planting mixture.

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