looks like a too high ph / over watering issue. what are you using for soil? a mix of pure peat or bark fines / compost and some perlite works best for blues. id change it out asap. it should bounce back pretty quick.
I am using coco coir
Thank you
I know of at least one variety that has lighter foliage than most. I wish I recall the name, but it’s a highbush variety. I have one and it produces very well.
It’s unclear what you’re doing with your plants. I doubt any blueberry will do well with constrained roots. Most neophyte tree/bramble/bush growers grossly underestimate the root size requirements of the things they grow. I prefer to grow my blueberries adjacent to sidewalks or driveways so the plants can grow roots in the moist earth under such structures.
Skydew and its patented here in the USA i believe. It would be extremely rare to find it in places outside of the us.
Add some soil acidifier, maybe a hint of blueberry fert, and water. If you have a ph meter you could test but this looks like what happens before all the leaves die due to high ph
If the bag you’re planting in is higher than a few inches from the base of the plant, you’re cooking your plant when temperatures get past 60 degrees Fahrenheit or so. I would cut the bag to just an inch above soil level if i were you.
Coco coir doesn’t hold nutrients so it’s extremely hungry. You may need to just replant it in regular potting soil if you’re planning on keeping it in pots. Add some soil acidifier when you so as well. A little bit at a time and wait 3 weeks to see if it starts to green up.
Unfortunately these things are highly inaccurate from my experience. I’ve used over 5 and none have been accurate in measuring anything except light
Are you using the ones over 100$? Mine matched what my extension got as result exactly