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A season of change at Walden Pond

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.

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.

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.

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