Do I need more than one bush for cross pollination to get berries?
BRBR

You will get some fruit even from one bush, but two are better. The standard
recommendation is to grow three different cultivars, one early, one midseason,
& one late. That way you get the maximum production over the longest period.
Since blueberries are attractive anyway, no reason not to.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)