In Northwest Florida blueberries thrive, but the trick I learned about planting and maintaining my plants/bushes was that upon planting use pine bark mulch in the existing soil, which helps feed the young plant and I use pine straw to mulch around them also. I have two that are 10 years old (of my original 5) and have replanted 5 others over the past three years. All using the same method using pine bark mulch in the existing soil. They like our sandy souls and I have fertilized them once they bare fruit, after the harvest, usually in late June. Good Luck.
