Blueberry help!

Hi all!

First time planting berries this year and I opted for a big mix to see what does well and how it would do in my area.

But my blueberries aren't doing so well and I'm not certain why.

A little context: I live in the Central Valley of California where our daytimes can be above 100 for most of the summer. Due to that I opted to plant them along an East to West oriented fence line. My idea was to give them some morning sun exposure but shade them from the intense afternoon sun. But even in the shade they leaves are shrivelling and appear dry.

Not sure what to do about them?

I've included a picture of the worst plant below, taken at about 12:30.

Thanks!

do they need more water?
During a dry summer here we water ours every few days as they need constant moisture, not standing water, just moist.

We had better luck with them protected from afternoon sun as you have done.

I don't recognize the leaf stress in your photo....someone else here will know

How long have the blueberries been planted? Did you acclimitise them before planting out? I think that just like I would acclimatise a plant that has been indoors to colder temperatures outside, you would need to do the same thing for a plant that is used to cooler temperatures. It looks like the leaves are cooked!
Probably the plant will recover if the roots are kept moist (but not waterlogged or anaerobic) as Judith suggests.

Do you get cold temperatures at night? That is another possibility perhaps, if the temperature swings are extreme, or a little frost on the leaves then intense sun....

Pour a mix of some hydrogen peroxide and water to her. That should bring her back up. Something going on with the soil. Blueberries like hills and sort of edges. Maybe try adding little some to bring the pH down.

That fence is bouncing a lot of heat off of it onto the plants, so they are getting extra heat.  More air circulation around them will cool them off, even if it's hot.  They will be quite big bushes if they make it, so moving them away from the fence at least 3 feet is a good idea.

Are they southern highbush blueberries that are meant for the warm southern US?  

Do you have dense clay soil?  You might want to add almost 50% granite sand in a planting hole that is 18 inches deep and 18 inches wide, mix the sand with the soil you pull out, add some compost.  Mulch over the top with more compost and 2" of small wood chips out 18" on either side.  Eventually mulch out beyond the dripline.

If digging a hole in clay is difficult, wet it thoroughly by dribbling water from the hose over the entire area you intend to dig for an hour, moving the hose around that area.  After an hour the clay should be soft and diggable.  If it's hard as you dig down, just add more water, wait 10 minutes for it to soak up the water, and dig again.  Clay soil has great nutrients, so don't get discouraged.

Blueberries have shallow roots, but they will reach down and out and you want them in more loamy soil.