Equisetum hymale (scouring rush horsetail)
General info: Commonly called scouring rush or rough horsetail grows best in medium to wet soils. This plant is a non-flowering evergreen perennial.
Landscape uses: Horsetail can grow in up to 4 inches of standing water which makes it perfect for bog gardens or borders of ponds or streams. This is a great plant for covering wet spots where nothing will grow. Be cautious because this plant is an aggressive spreading species.