Thanks you for the tips, I actually didn't know they were perennial. That said, I think they just aren't too fond of the climate here. I'd need a greenhouse (and space outdoors) or a heating mat and a decent sun light. I tried with chilies the other year, and even got a few fruits, but they were small and never ripened. The plant really struggled. To be fair, the plant was an experiment from the get-go. I germinated it from seeds I got in a cheapo chili flake jar from Lidl so I didn't have huge expectations to begin with.