Equisetum fluviatile aka River Horsetail

Equisetum fluviatile, also known as the water horsetail or swamp horsetail, is a vascular plant that grows in dense colonies along freshwater shorelines, ponds, swamps, ditches, and other still or sluggish waters with mud bottoms. This perennial herbaceous species reaches heights of 30-100 cm (rarely 140 cm) with erect dark green stems that are 2-8 mm in diameter and have about 10-30 fine ridges. At each joint of the stem, there is a whorl of tiny scale leaves measuring 5-10 mm in length, with black tips. Some stems also have whorls of short ascending and spreading branches, with the longest branches found in the lower middle of the stem. The side branches are slender, dark green, and have 1-8 nodes with a whorl of five scale leaves at each node. The water horsetail has the largest central hollow among horsetails, with the stem diameter being hollow to about 80%. It reproduces both through spores, produced in yellowish-green cones at the tips of some stems, and vegetatively through rhizomes. This horsetail is found throughout the temperate Northern Hemisphere, ranging from Eurasia to North America. It is sometimes considered an invasive species due to its hardiness and ability to overpower other garden plants unless controlled. It is often confused with the marsh horsetail (Equisetum palustre), which has rougher stems with fewer ridges and a smaller hollow in the stem center, as well as longer spore cones. Overall, the water horsetail is an upright, clump-forming, rhizomatous perennial with hollow, ridged, and jointed stems that exhibit yellow-brown banding. Thin branches emerge in whorls around the stem nodes, and fertile stems produce blunt spore-bearing cones at the tips.