Kendall County (IL) Forest Preserve District
Woodland Knotweed (Jumpseed)
Persicaria virginiana (Polygonum
virginianum)
[C-value
2]
Buckwheat
family (Polygonaceae)
Blooms
mid-July - mid-September
The native Woodland Knotweed is common in our area. It prefers part shade in moist woods and thickets. This perennial is 1-4' tall and branching with oval-shaped untoothed leaves up to 6" long and 3" wide. There is usually a terminal flower spike, which sometimes branches into multiple flower spikes. The flower spike is 4-16" long with tiny flowers occurring along the spike that are white to greenish white, 1/8" long, with 4 pointed-tip petals. The flowers are later replaced with oval-shaped dry seeds. When the seeds are ripe, they jump off the stem at the slightest touch, hence the other common name "Jumpseed".
Woodland Knotweed at Harris Forest Preserve August 20, 2013
Woodland Knotweed bloom at Millbrook South Forest Preserve August 14, 2017
Woodland Knotweed at Harris Forest Preserve August 20, 2013
Woodland Knotweed at Subat Forest Preserve August 14, 2013
Woodland Knotweed colony at Millbrook South Forest Preserve August 28, 2013
Woodland Knotweed seeds at Lyon Forest Preserve October 31, 2014
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