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Observations by Gary Fewless for Green Bay WI (Lat.N 44.51° Long. W 88.02° ), except as noted. For flowers lacking conspicuous petals or sepals I define "anthesis" as release of pollen by mature anthers.

May 2012 Mouse-over the photo for the identity of the subject
box elder flowers

May 31 First day of flower for black-eyed Susan (Rudbeckia hirta),UWGB (Josh Martinez).
May 29

Reed canary grass (Phalaris arundinacea) has begun to flower. This is one of the worst invasive plants in Wisconsin.

Also first day of flower for the shrub ninebark (Physocarpus opulifolius).

May 28 Bird's-foot trefoil (Lotus corniculatus) in flower. This is an alien species, very common along roadsides.
May 27 Spiderwort (Tradescantia ohioensis) in flower in UW-Green Bay's prairie.
May 25 Cow vetch (Vica cracca) in flower.
May 24 Clustered black snakeroot (Sanicula gregaria) in flower.
May 23

The Green Bay area is very dry--we've had no rain in the last 14 days.

Wild rose (Rosa blanda) in flower.

May 22

First day of open flowers for alsike clover (Trifolium hybridum), UW-Green Bay. This species looks somewhat similar to white clover, and is frequently misidentified as such. It is much more common than is generally understood.

Cow-parsnip (Heracleum lanatum) is now beginning to flower in the Green Bay area.

May 21 First day of abundant seed dispersal for cottonwood (Populus deltoides), UW-Green Bay, though they have been dropping immature aments for at least a week.
May 20

Green Bay reached a temperature of 90° F today, tying the record high for the day. The "normal" high temperature for this date is 70°. Yesterday's high was 89°.

First day of flower for yellow goat's-beard (Tragopogon dubius), UW-Green Bay. Also yellow iris (Iris pseudacorus) is in flower. It is an invasive alien species that is expanding rapidly in our area in sunny wet sites.

May 19

First day of fully open flowers for white clover (Trifolium repens).

Lightning bugs, Oconto County, Pensaukee (Tom Erdman).

May 18 First day of flower for American vetch (Vicia americana) and Kentucky bluegrass (Poa pratensis).
May 17 First open flowers that I have seen for daisy fleabane (Erigeron philadelphicus) at UW-Green Bay. [There were a few open flowers in Allouez on May 10]
May 16 First day of flower (anthesis) for orchard grass (Dactylis glomerata), UW-Green Bay.
May 15 First day of open flowers for our common wild raspberry (Rubus idaeus), UW-Green Bay.
May 14 This is the first night that Junebugs were flying in our neighborhood. Unlike most other phenology items this spring, this is not particularly early for the Junebugs.
May 13 Silver maple (Acer saccharinum) has begun general dispersal of mature fruits. Some immature and aborted fruits have been dropped over the last week or more, but this is the first of the mature fruits to fall. [by May 23 the great majority of the wild fruits have fallen.]
May 12 Alternate-leaved dogwood (Cornus alternifolia) in flower forest, UW-Green Bay.
May 11

First day of flower for bastard-toadflax (Comandra umbellata).

I can't put a precise start to it, but today the carp are spawning furiously along the Green Bay shore at UW-Green Bay.

May 10 First day of flower for red pine (Pinus resinosa, also called Norway pine locally) and golden alexanders (Zizia aurea) UW-Green Bay.
May 9 First day of flower for black cherry (Prunus serotina) and nannyberry (Viburnum lentago).
May 8

Red-osier dogwood (Cornus solonifera) in flower (a few scattered small flowers open late yesterday).

I saw my first Monarch butterfly today, UW-Green Bay's Cofrin Arboretum.

Click on the photo below to get the larger version. If you display the photo at its full height (about 700 pixels high) and move the horizontal slider, it is very similar to being on the site and turning your head to view a full circle. The larger file is 900 Kb.

A second view of the prairie, after a controlled burn on May 1 prairie panorama 2

And another for the UW-Green Bay forest dynamics plot.forest panorama
May 7 Spittlebugs on plants today.
May 6 Dame's-rocket (Hesperis matronalis) in flower.
May 5

I saw several Tiger Swallowtail butterflies in the Brown County Reforestation Camp today.

I had my first mosquito bites today (local and not too bad), Brown County, Town of Suamico.

Jacob's-ladder (Polemonium reptans) began to flower today.

I am seeing more Red Admiral butterflies this spring than I have seen in at least 10 years.

May 4

Wild Columbine (Aquilegia canadensis) began to flower, UWGB.

First day of flower (anthesis) for jack pine (Pinus banksiana), Brown County.

May 3

Canada mayflower (Maianthemum canadense) began to flower. Also a planted individual of American mountain Ash (Sorbus americana) began to flower in the Lenfesty courtyard of UWGB's MAC Hall.

Green Bay received 2 inches of rain since yesterday.

May 2

High temperature in Green Bay reached 80° F today.

Toads began "singing" in Prairie Pond and in a stormwater detention pond in Allouez (but see very early report during the etreme warm weather of March, for DePere March 22).

Green Frogs calling, Oconto County, Pensaukee (Tom Erdman).

May 1

Controlled burn of prairie on UW-Green Bay's Cofrin arboretum.

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Last updated on May 20, 2015