I just purchased a blueberry plant here in southern California. I planted it in good soil (with worm casings, bat guano, etc. ). I water it well every 3-4 days; however, the leaves at the top are drying out. Do I need to cut the plant back? What is causing the dried leaves? Am I over watering, not watering enough, etc. ? There are no bugs on the plant and it's very leafy. . . just seems that the leaves on the ends are drying out and turning brown and crispy.