blueberries red leaves
I've just planted 4 months ago 500 bushes of 3 year old Legacy and 500 bushes of 2 year old Bluecrop, that I have bought in pots from a local farm in my country.
I'm writing because half of their leaves are very red (see photos attached) and the one that are green have started to drop off and 3 of my bluecrop have lost all their leaves in a day.
The region I'm leaving (mountains) is a little colder than the region I bought them from (hills).
Since I've planted them, there has been enough rain and the soil is moisture, and I have also given them some granular, long term fertilizer (that contained also magnesium).
The soil pH was around 6, but I incorporated conifers sawdust and now is between 4 and 5,8.
Please be so kind and give me some advice.