In the 19th and 20th centuries, humans transported the Orange Jewelweed (I. capensis) to England, France, the Netherlands, Poland, Sweden, Finland, and potentially other areas of Northern and Central Europe. For example, it was not recorded from Germany as recently as 1996, but since then a population seems to have established itself in Hagen at the Ennepe river. These naturalized populations persist despite the plant not being grown in gardens on a regular basis. The Orange Jewelweed is quite similar to the Touch-me-not Balsam (I. noli-tangere) – the only Impatiens species native to Central and Northern Europe – and utilizes similar habitats, but no evidence exists of natural hybrids. Small Balsam (I. parviflora), originally native to southern Central Asia, is even more extensively naturalized in Europe. More problematic is the Himalayan Balsam (I. glandulifera), a high-growing species which displaces smaller plants by denying them sunlight. It is an invasive weed in many places, and tends to dominate riparian vegetation along polluted rivers and nitrogen-rich spots. Thus, it exacerbates ecosystem degradation by forming stands where few other plants can grow, and by rendering riverbanks more prone to erosion as it has only a shallow root system.