A study published Wednesday found that wildflowers at Walden Pond blossomed earlier during the record-warm springs of 2010 and 2012 than ever before documented, 21 and 20 days sooner, respectively, than observed by Henry David Thoreau during the 1850s.
A season of change at Walden Pond
Suzanne Kreiter/Globe Staff /File 2010
A study published Wednesday found that wildflowers at Walden Pond blossomed earlier during the record-warm springs of 2010 and 2012 than ever before documented, 21 and 20 days sooner, respectively, than observed by Henry David Thoreau during the 1850s.