The purpose of the International Waterlily and Water Gardening Society (IWGS) Certified Collections is to provide international recognition to collections of Nymphaea and Nelumbo around the world. In return the collections offer an opportunity to IWGS members and the general public to experience and reference the diversity of the genera of Nymphaea and Nelumbo.

The collections are critical to the conservation of these genera as they help promote interest within the gardening audience. Some of the Certified Collection sites may work with the IWGS to conduct plant trials and grow out the New Waterlily Competition plants for judging. The IWGS Certified Collection sites will have the full endorsement of the IWGS in projects that are related to its mission, as interpreted by the IWGS board of directors, e.g. letter of recommendation for grants/ funding; networking with hybridizers and growers; help in sourcing plants; displaying New Waterlily Competition Lilies at certified sites etc. The IWGS Certified Collections will be advertised on the IWGS website and in other appropriate publications as one of the IWGS Certified Collections of Nymphaea and/or Nelumbo.

Certified Collection Logo 2020


The Waterlily Collection at Latour-Marliac has been designated by the International Waterlily & Water Gardening Society as a collection of great historical importance. The Latour-Marliac waterlily nursery was founded in 1875 by Bory Latour-Marliac (1830-1911), an early and preeminent waterlily hybridizer. The Collection is curated in the brick-and-mortar cultivation pools that made up the original nursery. It has been recognized as the French National Collection of the genus Nymphaea since the 1990s.


Denver Botanic Gardens

Denver Botanic Gardens has been designated by the International Waterlily & Water Gardening Society as a Nymphaea collection of excellence and a Nelumbo collection of merit.  129 cultivars and species of Nymphaea and 25 cultivars of Nelumbo are displayed in seven water gardens throughout the Gardens' 24-acre property.  
IWGS Certified Waterlily Collection

International Waterlily Collection

The International Waterlily Collection has been designated by the International Waterlily & Water Gardening Society as a premiere collection of aquatic plants in the genus Nymphaea.  The collection is under the care of renowned waterlily hybridizer, Ken Landon.  Only a small percentage of the entire collection can be grown at the IWC each year, ensuring that each year’s display is unique.


Bergen Water Gardens & Nursery

Lotus Paradise, at Bergen Water Gardens & Nursery, is the first International Waterlily and Water Garden Certified Nelumbo Collection of Excellence.  Larry and Lili Nau have assembled an impressive collection of Chinese lotus over the past 5 years. Eighty varieties are designated as the IWGS Collection of Excellence but close to 400 varieties of lotus are growing on the property.

IWGS Certified Waterlily Collection

Bennetts Water Gardens

Bennetts Water Gardens is the first IWGS Certified Nymphaea Collection of Excellence in Europe. Established in 1958, the collection of hardy waterlily has grown close to 200 varieties.

Nymphaea Arrakis


Be the next collection to get certified by the IWGS!