Inter subgeneric waterlilies are hybrid waterlilies that are created by crossing two different subgenera within the genus Nymphaea. These hybrids often exhibit a combination of characteristics from both parent subgenera, resulting in unique and diverse waterlily varieties. They are popular among water gardening enthusiasts and are known for their vibrant colors and striking appearance.

Hardy x tropical waterlily hybrids are a cross between hardy waterlilies (Nymphaea) and tropical waterlilies. These hybrids are often bred to create a waterlily that can withstand cooler temperatures, making them more adaptable to varying climates. They typically display characteristics of both types, offering a balance of cold tolerance and vibrant colors. This combination makes them popular choices for water gardens in regions with fluctuating weather conditions.