Sweden planted colourful garden lupins across roadsides and disturbed land to control erosion, but after more than 100 years, scientists say the fast-spreading flowers now dominate native meadows, leaving fewer native plants for bees, butterflies, and other pollinators

Sweden’s roadside lupins, introduced for soil stabilisation, now spread aggressively across meadows. These invasive plants reduce native flora diversity and negatively impact insect populations. Garden lupins create dense canopies, blocking sunlight and altering soil chemistry for wildflowers. This ecological imbalance affects pollinators like bees and butterflies, which rely on diverse food sources. Targeted mowing and citizen science efforts are now underway to manage this botanical invasion.