The article "Maritime Hunter-Gatherers Adopt Cultivation at the Farming Extreme of Northern Europe 5000 Years Ago" (Santeri Vanhanen, Stefan Gustafsson, Håkan Ranheden, Niclas Björck, Marianna Kemell & Volker Heyd) presents archaeobotanical remains showing that Pitted Ware Culture hunter-gatherers adopted cultivation from Funnel Beaker Culture farmers, and brought it to islands beyond the 60th parallel north. The main subsistence for these hunter-gatherers was still hunting, fishing, and gathering, but the recent article argues that small-scale cereal use was intended for ritual feasts.
The article in full can be read online on the Scientific Reports website.