do you know what kind of bush you have. I found this online:
Blueray (northern highbush):
zone 4-7 Blueray (northern highbush):
zone 4-7
Blueray is a northern highbush blueberry bush. This variety is rated for hardiness
zones 4 thru 7. The berries ripen in the middle part of the blueberry harvest season. This bush will yield 7 to 10 pounds of berries per year. The size of the berries are large with a good sweet flavor. When the Blueray matures it will reach a height of 4 to 6 feet, with an upright open shape.
In the fall the leaves will turn bright red and yellow.