Flat-stem Pondweed (Potamogeton Zosteriformis) is a perennial aquatic in the Potamogetonaceae family with moderate care difficulty. It requires aquatic watering and full sun or partial shade light in USDA hardiness zones 4-9. This plant is safe for cats and dogs.

Potamogeton zosteriformis, commonly known as flat-stem pondweed, is an aquatic perennial herb distinctive for its conspicuously flattened, winged stems and lack of floating leaves.