I live in Zone 10a. I have a potted self-pollinating Sunshine blueberry bush that's supposed to do well in Southern California. The pot is maybe 12". I moved it from my front porch (4-6 hours sun) to my community garden with full sun last May. It keeps blooming and starting to fruit, but then the fruit never matures and eventually falls off. A heat wave last summer turned all the leaves brown, but I moved to partial shade next to a tomato plant and it recovered. Then the blooming/bud thing happened in the fall/winter. We've had a ton of rain in the last couple months. Now it's dropped most leaves again. I feed it with azalea food, but not for a couple of months at least. I try to keep it moist, but not over-watered. Any suggestions?
Blueberries in So. Cal – Sunshine Blue
Certified GKH Gardening Expert
If the fruits are very small when they fall off, poor pollination may be the cause. Self-pollinating bushes can still have poor yield due to pollination problems:
This could be improved by attracting bees to your garden using plants they prefer.
Blueberries also need even more acidic soil than other acid-loving plants like azaleas. You may want to have a pH test done to make sure your pH is low enough.