Exotic Live Aquatic Potted Plant Hygrophila difformis P095 ~Buy 2 GET 1 FREE All our plants pass USDA requirement Imported from the Rain Forrest in Thailand - USDA Certified Hygrophila difformis is a popular aquarium plant that has been in the trade for some time and is often sold under the name Wisteria. Hygrophila difformis has a very intricate leaf structure and a bright green color that makes it an attractive aquarium plant for background areas. Plant the stems in the substrate and remember to trim as needed. Emersed leaves of Hygrophila difformis take on a completely different appearance being smaller and round without any pinnate structures.