Blueberry fruiting issue
I have three blueberry bushes, that were giving me berries for at least last 4 years without any problem, even when they suffered from iron deficiency due to sweet soil. Since then, soil improved, and i expected this year to be exactly as previous. All three bushes flowered very well, the weather was reasonable for pollinators, and they've been working hard. Today I looked at the bushes and found that when 2 of them have green berries about a small pea size already, the third one has tiny, dry, hard half berry-half old flower. Some of them getting blue and just fell off. It doesn't look like I will get anything from this bush. The bush itself, however. looks great - young grows strong and green, no sign of general disease. What could be a reason for it?