June Flowering Phenology

by Carl Strang

First flower dates at Mayslake Forest Preserve in June continued the trend of convergence on earlier years that is typical of the progressing season. The median difference from 2014 for 71 species was only one day earlier, and two days earlier than 2013 for 69 plant species.

Butterfly weed was among the species that first opened flowers in June.

Butterfly weed was among the species that first opened flowers in June.

The biggest difference continues to be with the very early year of 2012, but that is down to a median of 11 days later for 71 species. The difference for the remaining three years is not large: 5 days earlier than 2011 for 61 species, 5 days later than 2010 for 49 species, and 6 days earlier than 2009 for 51 species.

Compass plants began to bloom just before the end of June.

Compass plants began to bloom just before the end of June.

These differences represented reductions of 6 days, 3 days, 7 days, 1 day, and 4 days from May values for the years 2014-2010. The difference for 2009 increased by 3 days.

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