Lonicera caerulea is establishing in mountain forest in the Dovrefjell mountains.
Lonicera caerulea is an alien species in Norway. It has high invasion potential and ecological impact in many habitats. At Kongsvoll, Dovrefjell, Lonicera caerulea is spreading from the garden plantings at the mountain hotel and establishes mainly into Betula pubescens forest and in Juniperus communis and Salix-dominated shrub heaths. The new seedlings establish between 880 and 920 m a.s.l., and these so far hold the altitude record for the species in Norway. Lonicera caerulea establishes along paths, in open grasslands, in cliff walls and on an exposed ridge. Most likely birds spread seeds from planted specimens. Naturalized plants occur mainly in the semi-natural Kongsvoll Alpine Garden and in birch forest close to the hotel. In 2015, action was taken and 104 naturalized plants were removed from the alpine garden. Most naturalized plants were lower than 20 cm. Ten plants were taller than 50 cm and some of these had already started to produce seeds. Eradication of plants from the alpine garden must be repeated regularly as long as the seed source is present. Cutting down planted specimens or removal of unripe berries could be a way to stop further naturalization. Total removal of the species from the region may still be difficult due to bird dispersal.