Blueberry bushes

I found a recipe online for a blueberry cake with a caramel topping. I also found a recipe for a blueberry CRUMB cake, that I thought sounded better, so I made this one. I was just wondering if it would be any good if I put the caramel topping on the crumb cake, or if [...]

Or can you plant a raspberry bush in place of a 2nd blueberry bush. I’m growing my first blueberry bush and just realized that I need a 2nd bush to pollinate. Just curious if is HAS to be a blueberry or can be another “similar” berry.