Water lettuce (Pistia stratiotes L.), also known as Nile cabbage, is a free-floating aquatic plant from the family Araceae, the same family as the arum lily. Today, water lettuce is considered an ...

Water lilies, while pleasing to the eye, are extremely invasive in North America, according to the Potomac Conservancy. The common daylily, particularly, is invasive in the Northern United States and ...