Hi Robert, hope this is the information you need to cage outdoor bush. cage around blueberry bushes to thwart the birds - Pinterest
Many people put their blueberries in a cage house to thwart critters (birds mainly) ... garden canes, garden bushes and vegetables, giving you space for larger or ...
I was wondering how large you are talking about?
can you get some wire fencing from tractor supply and cut it to fit around the bush?
PVC formed into a cage, then covered in whatever material you need, to fill the need you have. PVC is easy to use, and not too expensive. And if you don't glue it together, it'll be easy to store, or reuse for a different project.