Not sure if this has been suggested or not, but I tough this would be a nice little feature non the less.
So while Blueberries have some pretty great uses, mostly in baking goods, and they are pretty commonly available in most areas of the game, it still would be pretty neat if you could grow them yourself, mostly because you could upgrade their quality trough generations, and at the same time give some more variety for farmers and their farms. Not to mention the amount of Blueberry Pie you could make by finnaly having a self sustaining newbie baking factory.
But besides that what do you think about the idea, could it be possible. Also this wouldn't only apply to Blueberries, I just used them as an example.