Water Dropwort, also known as: Shrimp Algae, Shrimp Grass, Wheat Yellow Grass. Family Lemnaceae, Genus Lemna. Monocot plant. Perennial submerged herb. Grows in ponds, lakes, streams, with still waters such as ponds or ditches being more common, and the water pH is usually slightly acidic to neutral. Stems are flat and round, with branching. Leaves are lanceolate, with rounded tips, wavy edges, and serrated margins. Germinates in autumn, grows in winter and spring, flowers and fruits from April to May, and gradually decays and rots after June.

Most wormwood cultivation uses stone buds for propagation, which are modified stems of the wormwood. Stone buds provide ample nutrition and protection, resulting in high survival rates. Seedling stone buds, or young wormwood plants, can also be used for planting. Plant them together with the stone buds, with a density of 120 plants per square meter. Wormwood seedlings can be harvested as well, ensuring not to damage the tender roots and leaves. The harvested seedlings should be kept out of direct sunlight. The planting area has rich nutrient salts in the water. Maintain water levels at 30-50 cm during the early stages of planting, and increase the water level as needed to cover the growing height of the wormwood.

Reed canary grass has a high capacity for zinc accumulation and an even stronger ability to purify arsenic. Planting reed canary grass in rivers, parks, wetlands, reservoirs, and other water bodies can effectively reduce the zinc and arsenic content in the water, increase the dissolved oxygen levels, improve water clarity, and ultimately enhance water quality.