I have two blueberry plants in half wine barrels side by side. I've had them for several years now. This year, the Reveille is laden with fruit buds. But while it's leafing out, the O'Neal has barely a handful of fruit buds. Both were planted at the same time. Both have been watered the same, fertilized the same, etc. Why would one plant produce a bumper crop while the plant two feet away has barely a blossom?