Couple years ago I bought a single blueberry from a big box store instead of a local nursery. It is a Biloxi which I’ve since learned is a low chill variety.
Will a southern blueberry fruit in Zone 5 or should I replace it now and save myself the effort?
I’m reading it’s hardy to - 10°, for whatever that’s worth.
I assume you have another blueberry variety for pollination?
14 other bushes in 9 other varieties 
It is still small but most of my other bushes at least pushed a few flowers when they were this small. It otherwise is doing quite well except for the lack of flowering
I bought 3 very small bushes this spring…about a foot tall. One is a Biloxi. They were all flowering when bought and continued to upon planting. I’m way down in zone 9a.
I removed most of the set fruit but kept a few to try. Luckily we have naturally acidic spoils here so blueberries do well…