I mean there probably are lots of reasons why we farm only certain plants.

For example dewberries have short harvest window and as far as i know they need to be hand picked.

Blackberries are pretty rampant here in the UK. Always wondered why you guys didn’t have it- Seems they were banned in the US until recently due to some fungus.

Just to be clear, you mean blackcurrants, yes? Blackberry means something quite different, at least over here.