Creeping jenny; Moneywort
Lysimachia nummularia

Creeping jenny; Moneywort (Lysimachia nummularia) is an invasive plant. It is a native of Europe and was first detected in North America.

This weed spreads aggressively under favorable conditions, such as low wet ground or near ponds, and can crowd out other plants.

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Summaries of State Plant Protection Laws and Regulations
Wisconsin