I have just spent several days in the breathtaking mountain landscapes of the Nahuel Huapi National Park (San Carlos de Bariloche, Argentina) together with Ann Milbau, Jonas Lembrechts, Anibal Pauchard and Martin Nuñez talking about plant invasion at high altitudes and latitudes. I’m still very much a novice in the field of plant invasions and thus this post might sound pretty naive to those of you who are plant-invasion geeks. Anyway, I think that I’m learning a lot by hanging around Ann, Jonas, Anibal and Martin who all know a great deal on this topic and thus I’m giving it a try. Please, correct me if I’m saying anything stupid here. One thing that I have rapidely understood is that although these cold and harsh environments are among the least invaded ecosystems in the world, nonnative plants are becoming increasingly common in these environments (Pauchard et al., 2009