The woods here are full of highbush blueberries, always amazes me how nuts they get below the soil. I have learned that just because they have a 1 inch trunk above the soil, that it may flare out to 5 inches or more under the soil. They'll lose the main trunk at some point and grow a new one I assume based on some I find with multiple rotted out holes in the root flare that have a lot of character. I dug up 7, I think, last year and they all survived, 2 abandoned their trunk and suckered from the base though sadly.
The growth habit giveth and the growth habit taketh away.