They may impact Carpenter bees by competing with them for shelter. Vernonia is a late season plant. Attracts Butterflies. Flowers from June to October. [1] The plant is native to the eastern United States, north to New York state and Ontario, and southwest to Texas. These plants are moderately attractive to bees and butterflies. Typically this genus does well in average to moist soil. Mailstop Code: 1103

It is 8 feet tall, narrow with purple flowers on the top.… Plant Identification – Japanese Knotweed. top. Two species are native to Ontario. It takes so long to emerge that you may well think it has died during the winter. New York Ironweed can handle clay and a fair amount of shade.

They can be found growing in moist soils by the roadsides, and are common in the meadows and open woodlands. Group of 9-foot tall plants. [6], "A Study Of Ecotypes In Vernonia Gigantea Gigantea (Compositae)", https://en.wikipedia.org/w/index.php?title=Vernonia_gigantea&oldid=963810274, Creative Commons Attribution-ShareAlike License, This page was last edited on 21 June 2020, at 22:57. Many different groups of plants fall into this family based on grouping and type of flowers. Two species are native to Ontario. The flowers are purple, rarely white, in this species. Range map of Vernonia gigantea. It is a strong competitor in the garden and can soon become weedy when cultivated. Vernonia gigantea (also known as giant ironweed,[1] tall ironweed[2] or ironweed[3]) is a species of perennial plant from family Asteraceae found in United States and Canada. top. The leaves' base has either a petiole or sessile. Partial Sun/Shade. The leaves are up to 10 inches long and 2½ inches across, and are ovate. This ironweed is 1 to 3 meters (3.3 to 9.8 feet) tall. They can hybridise. It is most common in the Ohio and lower Mississippi valleys. It is especially common in overgrazed pasture.

Habitat . Flora of North America: Vernonia gigantea, US Forest Service, FM-RM-VE It is also known from Michigan and Ontario. Each tube is 5 petals that are fused together at the bottom and separate at the top. The plant is native to the eastern United States, north to New York state and Ontario, and southwest to Texas. Vernonia missurica and Vernonia gigantea. Each flower has a pistil (female part) and stamens (male part). Heads are generally in clusters of 10 to 20 at the end of branches and multiple branches may loosely overlap to produce flowering masses 10 to 18 centimeters (4 to 7 inches) across. Vernonia noveboracensis - New York Ironweed. [3], The seeds are wind-dispersed. Giant ironweed is a member of the Asteraceae, the Sunflower family. Close up of flowers Photo by David D. Taylor. The plant is self-incompatible and exhibits substantial ecotypic variation, a factor which may explain their broad geographic distribution. A third species, Vernonia noveboracensis, is also native to the North East, but not in Canada. Since the leaves are not outstanding in any way, it is better to plant them at the back of the border behind other plants. Each head generally has 15 to 25 individual disk flowers in it. native plants at all stages of their lifecycles, from newly emerged plant, to flower to seed stage. None of the plants I found had leaves showing that feature but it can be used as an I.D. Leaves are alternate, 10 to 30 centimeters (4 to 12 inches) long, and 2 to 4 centimeters (0.75 to 1.5 inches) wide.

Drought Tolerant. Prairie Ironweed's are significantly shorter and narrower, only averaging 5" long and 1/2" wide.

Photo by David D. Taylor. I've read where Prairie Ironweed leaves undersides can exhibit a habit of pitting; more or less a lot of dark dots. This species has one of the largest ranges of the ironweed species. Vernonia missurica.

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