You are right - it is endemic to Western Himalaya.
However, it is commonly cultivated both in Europe (since 1839), temperate
Asia and North America, New Zealand, recently also in Chile.
As the species of higher altitudes it acclimatises easily and invade
temperate zone. There are spontaneous records from almost whole
Europe, Japan, Alaska, British Columbia, eastern USA and Canada, New
Zealand.
I personally saw it in many places in Poland and in Siberian Russia near
Novosibirsk. At the moment I. glandulifera is most succesfull invader of
any Impatiens
Wojciech
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