Spread the cut oreganos on a piece of newspaper for a some days to get them tried.
You can use some of them for cooking later. Most herbs are originally from Europe where it's not so hot and humid even in summer, so sometimes I do cut some herbs to let them survive in rainy season here in Japan. I don't think I really need to do this while I am in Hakuba, but would like to let them stay comfortable. Some herbs like basils are from semi tropical zone, so they are okay with hot and humid weather.