CAN PH LEVELS TOOOOO ACIDIC HURT YOUNG BLUEBERRY PLANTS?
Certified GKH Gardening Expert
Probably not, but you don't say what the pH value is for your blueberry plants, so it is hard to say. Be sure you are growing the best type for zone 9. This article should help:
The best pH is between 4 and 5. You can have your soil tested and make adjustments.