I just moved to a home in The Woodlands, TX. We have a green border with Japanese blueberries. Some of them stared to die suddenly in a period of 2 days. They stared to wilt from the bottom to the top.The ones that are dying or already died are in different locations. Any clue as to what is going on? There are 2 pictures attached.
Thanks

They are probably showing stress from the summer we just had...many things are.
I would scratch the limbs to see if they're still green and alive. Once a week give them all a deep watering and you may want to lightly fertilize with an acidified fertilizer. Do you know what the botanical name of the shrub is?

Thank you.
I think the botanical name is Elaeocarpus Decipiens.

I'm not sure how cold you were last winter, but if it was anything like in the Dallas area it was way below normal. I think the one-two punch of last winter and this summer may be too much for them here.

Hardiness:
USDA Zone 8b: to -9.4 °C (15 °F)
USDA Zone 9a: to -6.6 °C (20 °F)
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
USDA Zone 11: above 4.5 °C (40 °F)