Blueberry plants are shrubs which mean they will sprout new shoots from their base. These new shoots can eventually be divided off to become new divisions, or left to grow. This ensures the survival of the plant. Shooting typically starts in the late summer, and continues until it is no longer warm enough to grow.
Here are a few pictures showing how this looks.
Blueberry shoots can emerge several inches away from the main plant.
Here's how these new shoots from the previous pictures should look after another year of growth. They typically take 2 years from the point of emerging to the time they start setting fruit.
Here are links to my previous blog posts on blueberries in case anyone is interested.