Stockholm, June 9, 2026 – The Europe Today: Sweden’s annual Pre-Summer Survey has revealed that lilacs are now blooming as far north as Haparanda, marking a significant shift in flowering patterns and highlighting the long-term effects of a changing climate.
The survey, conducted each year on Sweden’s National Day by the Swedish University of Agricultural Sciences (SLU) and the Swedish Botanical Society, found that flowering has reached record northern levels compared with historical observations.
Researchers noted that 100 to 150 years ago, lilacs would only have been in bloom at this time of year in the southernmost parts of Sweden, particularly in lower Skåne and Halland. This year, however, lilacs have already flowered across all of Skåne, along the southern east coast, and as far north as Haparanda near the Finnish border.
According to SLU researchers, the findings provide a clear indication of ongoing environmental change. While flowering times can vary considerably from year to year due to weather conditions, scientists emphasize that long-term trends offer the most reliable evidence of climate-related shifts.
This year’s survey incorporated approximately 11,000 public reports documenting the flowering of some of Sweden’s most common early-summer plants, making it one of the country’s largest citizen science initiatives tracking seasonal changes in nature.
The latest results underscore how rising temperatures are influencing plant development and extending growing conditions further north than was historically possible.
