July Flowering Phenology

by Carl Strang

Flowering phenology in July kept pace with observations for the season so far, with 2011 first flower dates close to those in 2009 and a few days later than those in 2010.

July is, in my view, the peak month for prairie flowers.

At Mayslake Forest Preserve, the median difference between first flower dates in 2009 and 2011 was 0 days (range 17 days earlier to 27 days later than 2009, with a sample size of 55 species). The median difference was 7 days later in 2011 than in 2010, range 38 days earlier to 42 days later, sample size again 55 species.


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