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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.

August 2007

Aug 24 I missed the start, but Aster lanceolatus (panicled aster) is in flower, UWGB.
Aug 22 Solidago canadensis (Canada goldenrod) is the most common and most numerous goldenrod in our area and it has about reached its peak, which will last for several weeks. It began to flower on UWGB on August 1. Although we have 11 species of Goldenrod in Brown County, Canada goldenrod is by far the most numerous and is generally responsible for the bright yellow displays in local fields and roadsides. It is NOT responsible for the hayfever experienced by many people at this time of year (see entry for Aug 3). To learn more about the goldenrods of Wisconsin start here.
Aug 21 Helianthus tuberosus (Jerusalem artichoke) is beginning to flower in City of Green Bay.
Aug 20 High temperature of 65° F in Green Bay and another 0.36 inches of rain.
Aug 19

Green Bay received 0.88 inches of rain. This will help replace the soil moisture, but there is no way to make up the 30 days of essentially no rain in July and early August, in terms of the plants growth and development.

Green Bays daily high temperature was only 62° F. That is a big change from the three consecutive days of 89 on Aug 10-12.

SW Wisconsin received more rain (LaCrosse reports 2.47 inches). There is severe flooding in that area.

Aug 18

Green Bay received 0.38 inches of rain. Southwestern Wisconsin received much more rain, for example LxCrosse reported 4.05 inches and there are reports of flooding in that area as weel as in adjacent areas of Minnesota. Areas to the north received much less, e.g. Rhinelander had only a trace of rain.

Green Bay's morning low temperature was 46° F.

Aug 12 Another day reaching 89° F, but today we received 0.44 inches of rain..
Aug 11 Hot weather continues in NE Wisconsin with a second consecutive day reaching a high temperature of 89° F (and 86 the day before). The dry conditions persist and now it is 30 days with a total of 0.10 inches of rain.
Aug 09 Although there has been rain and even flash flooding south of Green Bay, we are still very dry and have received only 0.10 inches of rain in the last 28 days. This will take a toll on the plants and I am hearing reports of leaf color fading on weaker trees. If we get lots of rain in the Fall it may bring the annual average up to "normal", but plants need regular moisture and the annual total can't compensate for such long dry periods during the growing season.
Aug 08

I don't have plants close to monitor on a daily basis, but by today Aster umbellatus (flat-topped aster), Helianthus giganteus (giant sunflower) and Echinocystis lobata (wild cucumber) are in flower, Brown County, Town of Suamico.

Aug 06 Solidago rigida (rough goldenrod), Lespedeza capitata (prairie bush-clover) and Eupatorium rugosum (white snakeroot) in flower on UWGB's Cofrin Arboretum. If you are new to the goldenrods, you might benefit from this introduction.
Aug 03

Green Bay has now received only 0.09 inches of rain in the last 21 days. Lack of rain, together with the recent hot temperatures will place extreme stress on plants.

Ambrosia artemisiifolia (common ragweed) is beginning to flower in northeastern Wisconsin. Although many people do not recognize this plant, it is the leading cause of "hayfever" in August and early September. Solidago canadensis (Canada goldenrod) is often blamed for the hayfever, but it is innocent of the charge. Because it is tall with large clusters of bright yellow flowers at the peak of the hayfever season it is blamed for the hayfever. Ragweed in contrast is smaller with inconspicuous flowers and often goes unnoticed.

Every year I hear people talking about the "summer cold" they get every year in August. If you develop cold-like symptoms about mid-August, you might want to consider the possibility that you are allergic to ragweed pollen. Unlike true colds, hayfever is treatable and people can get very good relief with medication.

Another species of ragweed, Ambrosia psilostachya (perennial ragweed) is roughly similar to A. artemisiifolia and begins to flower at about the same time, but its numbers are far fewer and its contribution to hayfever is probably very small.

Aug 01

August begins with hot and humid weather. High temperature of low 90's is predicted for the third consecutive day.

Convolvulus arvensis (field bindweed) is thriving in the Green Bay area. It is one of only 3 noxious weeds listed for Wisconsin. The other 2 noxious species are Cirsium arvense (Canada thistle) and Euphorbia esula (leafy spurge). There are many other plant species that cause more problems than these three, but Wisconsin has not yet adopted a more comprehensive approach to invasive species.

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Last updated on May 20, 2015