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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 2006

May 29

Anemone canadensis (Canada anemone) and Hydrophyllum virginianum (Virginia waterleaf) in flower, UWGB. Both common names of these plants are exact translations of the Latin names.

Also new in flower on UWGB, Trifolium repens (white clover), Trifolium hybridum (alsike clover) and Trifolium pratense (red clover), Baptisia alba (white wild indigo), and Osmorhiza longistylis (long-styled sweet-cicely)

May 28

There were strong thunderstorms overnight May 27/28. High winds blew down trees and power lines and heavy rains caused some small streams in the Green bay area to "flash" with substantial flooding of UWGB's Mahon Creek and nearby Baird's Creek. Green Bay received 1.53 inches of rain.

Green Bay reached a high temperature of 88° F today, one degree below the record high for this date. High humidity contributed to an unseasonably hot day, as part of the Memorial Day weekend.

Vicia americana (American vetch) in flower, UWGB, and several weedy aliens species also: Elaeagnus umbellatus (autumn olive), Leucanthemum vulgare (ox-eye daisy), Sisymbrium altissimum (tall tumble mustard).

May 27 Berteroa incana (hoary alyssum) in flower in fields, UWGB. Early plants growing in yards, beside buildings, etc have been flowering for at least a week. Potentilla simplex (common cinquefoil) in flower, UWGB.
May 26

Prunus serotina (black cherry) in flower, UWGB.

Also Pinus sylvestris (Scotch Pine) is in "flower" (anthesis). This is mostly a cultivated tree here, but it is very commonly planted as an ornamental.

May 25

First day of flower (anthesis) for Poa pratensis (bluegrass) UWGB. The inflorescences have been open for several days, but I did not see any open anthers until today. This is a very common and abundant grass in our area and some people will suffer from allergies to this new pulse of pollen.

First day of fully open flowers for Lupinus perennis (wild lupine), Zizia aurea (golden alexanders), Erigeron philadelphicus (daisy fleabane) UWGB.

First Monarch butterfly on UWGB (see an even earlier note on May 16 for Town of Scott). This is the earliest I have ever seen Monarchs on UWGB.

A few green frogs doing the famous "banjo" note on UWGB's prairie Pond--the earliest I have recorded there.

I missed the start of flower for Hesperis matronalis (dame's rocket) while out of town. It happened between May 20 and 24, probably about May 22 based on level of development when I returned.

I have brushed a few off, but I still have not received my first mosquito bite of the year, in spite of considerable time in the forest!!

May 24

First day of flower for Tragopogon dubius (yellow goat's-beard), Brown County, Allouez.

May 19 First open flowers of Polygonatum pubescens (Solomon's-seal) and Cornus stolonifera (red-osier dogwood) UWGB.
May 18

First day of flower for Polemonium reptans (jacob's-ladder), Brown County.

First day of flower for Viburnum lantana (wayfaring tree), UWGB.

May 17

The first junebugs flying at my home in Allouez, Brown County WI.

First day of flower for Maianthemum canadense (Canada mayflower) and Galium aparine (cleavers), UWGB.

May 16 First monarch butterfly observed in the Town of Scott, Brown County. This is the earliest date that I can remember seeing one here in Brown County, Town of Scott (Joel Trick).
May 13 Cold air remains, but the rains are light and there were some long periods of no rain. A few new plants in flower on UWGB: Actaea rubra (red baneberry) and Aquilegia canadensis (columbine).
May 12 Cold air moved in behind the rain and Green Bay's high temperature for the day was 46 F.
May 11

There was a strong storm in northern Wisconsin today. In Green Bay there were strong winds out of the north all day. The average wind speed for the whole day was 23 mph, with the highest two minute average wind of 39 mph, and a peak wind of 49. Green Bay received about 2 inches of rain in the storm (including rain that continued into May 12). Green Bay's low temperature was 38 F and the high was 54 F, and there was some wet heavy snow farther north.

The storm blew down many trees and tree branches in northeastern Wisconsin and there were numerous power outages from electric lines knocked out by falling trees. The local news media reported about 10,000 Door County residents lost power during the storm. There was more tree damage on UWGB's Cofrin Arboretum than I have seen from any storm in the 30 years that I have been in close contact with it.

The high winds also produced a new "drift" of shells from the zebra mussels in Green Bay.

May 10

Geranium maculatum (wild geranium) new in flower today, UWGB. I saw a few open flowers yesterday in the Town of Lawrence, Brown County. Also the first day for fully open flowers on Lonicera xbella (showy bush honeysuckle), an invasive species in our forests. Also first day of flower for Prunus virginiana (choke cherry) in Allouez.

There was obvious new growth in grasses burned in UWGB's Keith White Prairie only 6 days ago. If there is a little rain and the weather is mild it is amazing how quickly the new growth follows a spring burn.

May 09 A cloudy day with some rain. I don't normally report all the grasses and sedges in flower on this page, but since there is nothing else to report today, a grass (Alopecurus pratensis) meadow foxtail, and a sedge (Carex stipata) common fox sedge are new in flower today, UWGB.
May 08

Populus tremuloides (quaking aspen) dispersing fruit on uwgb.

Phlox divaricata (wild blue phlox) has begun to flower, UW-Green Bay.

May 07

Maianthemum stellatum (False Solomon's-seal -- long known as Smilacina stelllata) and Mitella diphilla (bishop's-cap) have begun to flower, City of Green Bay.

I also saw Medicago lupulina (black medick) in flower on UWGB, but I obviously missed the first day.

May 06 A few Aesculus hippocastanum (horse chestnut) beginning to flower, City GB. Also a few Malus pumila (apple) and Crataegus mollis (hawthorn). There are also many flowering crabs at about their peak flowering now in Green Bay.
May 04 Thalictrum dioicum (early meadow rue) in flower (anthesis), UWGB.
May 03

Toads calling on Prairie Pond, UWGB. Last year I first heard them calling there May 07.

Zanthoxylum americanum (prickly ash) in flower (anthesis), UWGB.

Prunus pumila (dwarf sand cherry) and Waldsteinia fragarioides (barren strawberry) in flower in MAC Hall's Lenfesty Courtyard.

May 02 Warmer today and only a few sprinkles. New in flower, UWGB: Sambucus pubens (red elderberry), Ranunculus abortivus (small-flowered buttercup) and Prunus pensylvanica (fire cherry).
May 01

Cloudy and cool, high temperature of 57 and a little rain. Not much new to report.

Junebug flying, Oconto County, Pensaukee (Tom Erdman).

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Last updated on May 20, 2015