1. Tropical Water Lilies: Day-Blooming Cultivars
　　Some cultivars hold a U.S. plant patent; these are noted under "Comments," along with their patent number. Such patents expire 17 years from issue and are not renewable. "Comments" also include reference to what size pool is suitable. Although there are no hard rules differentiating pool sizes, general guidelines follow:
　　　　　　　　　　　Tub garden: up to 3 ft (1m) in diameter
　　　　　　　　　　　Small: 4-6 ft (1.2-2m) in diameter
　　　　　　　　　　　Medium: 7-9 ft (2.2-2.7m) in diameter
　　　　　　　　　　　Large: 10 ft (3m) in diameter or larger
　　　　　　　　　　　Natural pond: dirt or mud bottom pond of any size
　　Note that copper and redwood are toxic to plants and fish and should be used only in conjunction with a plastic or other fish-safe liner.
　　To plant a tropical water lily, separate the plant from the sprouted tuber and spread the roots out in a depression in the middle of the planter. Firm the soil down and top with 1 in (2.5cm) of fine gravel or coarse sand. Place the planting immediately under 6-12 in (15-30cm) of water (Plates 130-132). Plant tropical water lilies only when the water temperature averages 75°F (24℃) or above. Planting too early may cause plants to go dormant .
　2.Tropical Water Lilies:Night-Blooming Cultivars
　　Note that "Stamen color" refers to the color the filament, the basal portion of the stamen. "Leaf size" is either the diameter of the leaf of a mature plant or the measurements of its length and width, in that order. "Leaf spread "refers to the diameter of the area on the water's surface covered by the leaves of a mature plant .
　　"Comments" on each plant include reference to what size pool is suitable . Although there are no hard rules differentiating pool sizes, general guidelines follow:
　　　　　　　　　　　　Tub garden: up to 3 ft (1m) in diameter
　　　　　　　　　　　　Small: 4-6 ft (1.2-2m) in diameter
　　　　　　　　　　　　Medium: 7-9 ft (2.2-2.7m) in diameter
　　　　　　　　　　　　Large: 10 ft (3m) in diameter or larger
　　　　　　　　　　　　Natural pond: dirt or mud bottom pond of any size
　　Note that copper and redwood are toxic to plants and fish and should be used only in conjunction with a plastic or other fish-safe liner.
　　Plant tropical water lilies only when the water temperature averages 75°F (24℃) or above. Planting too early may induce dormancy .
　3.Hardy Water Lily Culivars
　　The term "hardy", when used to describe water lily cultivars, generally means that the plant will survive winter temperatures as long as long as the rhizome itself does not actually freeze . Many of the finest descend from Nymphaea alba var. rubra, the Swedish red water lily , which species is native to ponds and two cold lakes (Lakes Fayer and Fagertarn) in Nerike , Hammar Parish , Sweden .
　Some cultivars will not bloom freely , or blooming will be interrupted , when air temperatures remain in the 80-90°F (27-32℃) range for prolonged periods .
　　Another climatic effect resulting from high summer temperatures is an effect known as petal "burning" or "melting". During hot days when summer temperatures reach the upper 80s to 90s (29-32℃or more ), flower petals may blacken . Blooming is not necessarily interrupted and the burning of the petals stops with cooler weather .
　　Note that "Stamen color" refers to the color found on the basal portion of the stamen, also known as the filament . As hardy water lilies also have staminodes , located just outside the stamens, my reference to stamens also includes the base portion of the staminodes . "Leaf size" refers either to the diameter of the leaf of a mature plant or to the measurements of its length and width, in that order . "Leaf spread" refers to the diameter of the area on the water's surface covered by the leaves of the mature plant .
　　"Comments" on each plant include reference to what size pool is suitable . Although there are no hard rules differentiating pool sizes, general guidelines follow:
　　　　　　　　　　　　　Tub garden: up to 3 ft (1m) in diameter
　　　　　　　　　　　　　Small: 4-6 ft (1.2-2m) in diameter
　　　　　　　　　　　　　Medium: 7-9 ft (2.2-2.7m) in diameter
　　　　　　　　　　　　　Large: 10 ft (3m) in diameter or larger
　　　　　　　　　　　　　Natural pond: dirt or mud bottom pond of any size
　　Note that copper and redwood are toxic to plants and fish and should be used only in conjunction with a plastic or other fish-safe liner .
　　Plant hardy water lily cultivars only when the water temperature reaches 60° F(16℃) or above.