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Invasive species are a problem. There exists an official list from 2018 of alien species and their risk towards the biodiversity in Norway.

If you want to learn more about Sitkagran (Sitka spruce), take a look here.

If you are interested in reading more about Sitkagran (Sitka spruce) in Norway, here is an article conserning alien tree species along the coast of Helgeland.