Phenology First Take

by Carl Strang

One of the best ways of assessing how a given year compares with previous ones is by looking at first flowering dates. With April now complete, I can review those for Mayslake Forest Preserve. On the whole, this April can be regarded as slightly early, thanks to significant early warm days melting the snow and warming the soil.

Dutchman’s breeches bloomed abundantly at Mayslake this year.

Dutchman’s breeches bloomed abundantly at Mayslake this year.

Comparing median first flower dates in April places 2015 6 days earlier than 2014 (11 species), 9 days earlier than 2013 (20 species), 6 days earlier than 2011 (21 species), and 3 days earlier than 2009 (17 species). This April was 9 days later than 2010, and a substantial 25 days later than the anomalous warm year of 2012.

Most of these differences are not very large, and the expectation is that they will gradually diminish over the coming months.

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