Greater Marsh St. John's-wort (Hypericum Walteri) is a perennial herb in the Clusiaceae family with moderate care difficulty. It requires high watering and full sun or partial shade light in USDA hardiness zones 5-9. This plant is safe for cats and dogs.

Hypericum walteri is a flowering plant native to the eastern United States, commonly found along waterbodies such as lakes, streams, marshes, and swamp forests.