June Flowering Phenology

by Carl Strang

The season, as measured by first flowering dates at Mayslake Forest Preserve, continues to be early when compared to recent years. Median values in fact remained close to those in May. The median difference for 43 species was 17 days earlier than last year, with a range of 37 days earlier to 4 days later.

The wild bergamot was typical, blooming 17 days earlier than in 2011, 13 days earlier than in 2010, and 17 days earlier than in 2009.

The difference was less extreme between this year and 2010, with a median value of 8 days earlier for 35 species, and a range of 62 days earlier to 17 days later. Results for 2009 were similar to last year’s. The median difference was 19 days earlier this June for 39 species, ranging from 37 days earlier to no difference.



  1. nickonnature said,

    July 5, 2012 at 8:11 pm

    Carl: Heard the first striped ground cricket of the season here in western NY singing this afternoon. Isn’t this quite early for that species of cricket? Are you hearing them in Illinois yet? I’m curious just how far ahead of schedule the insects are this year.

    • natureinquiries said,

      July 6, 2012 at 5:55 am

      Hi, Nick,
      Singing insects have been appearing early out here with only an exception or two so far. We had a mild winter and a warm early spring, which both allowed eggs to hatch sooner and overwintering nymphs to complete their development sooner. The same conditions produced early plant growth, which of course also helps by providing food. There is a large enough distance between northeast Illinois and western New York that I would not assume that results would be the same in both places. I encourage you to keep records of first song dates so that you can make your own local comparisons from year to year.

  2. nickonnature said,

    July 6, 2012 at 10:38 am

    Thanks for the info! I am not sure but I think this is very early for crickets in this part of the country (I don’t keep “first song” records but want to get started.) I hadn’t noticed anything on here about crickets and was just interested to see if they were beginning there as well.

    • natureinquiries said,

      July 7, 2012 at 5:54 am

      Sorry, Nick,
      I didn’t address that part of your question. All three of the common ground crickets have started singing in recent days. My first song dates were June 29 for the striped, July 1 for the Carolina, and July 5 for Allard’s. Those are my earliest records over the last 6 years, by 7 days for striped, by 10 days for the Carolina ground cricket, and by 7 days for Allard’s.

  3. nickonnature said,

    July 7, 2012 at 5:01 pm

    Thanks for the reply and the data! I think these insects must begin later in the year here then in IL, but I can’t be sure because like I said this year is the first I’m keeping records. Last night I heard the first sword-bearing coneheads and northern bush katydids–yikes! Western NY is in an explosion of early insect song!

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