Long time before becoming fashionable, carnivorous plants created a keen interest XIXth century. To give an evidence is the excellent book Insectivorous plants of Charles Darwin. This one also considered Dionaea muscipula to be the most wonderful invention of nature. Some orchid enthusiasts then began to be interested in Nepenthes, of quite similar culture as their plants, for the beauty of their pitchers and created numerous hybrids. But they were also in mexican Pinguicula to get rid of small flies flying around their orchid pots.
In addition, other people get interest in temperate carnivorous plants such as Drosera rotundifolia and Sarracenia purpurea. This interest was so strong that in Europe some people implanted a few purple pitcher plants in Ireland, United Kingdom, Switzerland and France. Now being a intergral part of some peat bog landscape, one can observe them in France mainly in Jura Monts and Alps. Here are a few plants that can be seen in l'Etang du Grand Lemps, a swamp equiped with a pathway to welcome visitors and teach them what is life in a peat bog:
Regards
Aymeric
if they can be controlled so I guess it's okay to leave them there. Sorry for the English, Google Translate is pretty bad.