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Nymphaea alba, photo courtesy of Photolibrary
Nymphaea alba, photo courtesy of Photolibrary

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Zone
Zones 1-24, H1, H2
Full Sun
Full
Ample Water
Ample

Nymphaea

Water Lily

Aquatic, Flowers

These aquatic perennials grow with their roots in submerged soil and their long-stalked leaves floating on the surface. Floating leaves are rounded, with a deep notch at one side where leafstalk is attached. Showy flowers either float on surface or stand above it on stiff stalks. There are hardy and tropical kinds. Hardy types come in white, yellow, copper, pink, and red. Tropical types add blue and purple to the color range; recent introductions include an unusual greenish blue. Some tropicals in the white-pink-red color range are night bloomers; all others close at night. Many are fragrant.

Hardy kinds. These are easiestfor beginners. Plant themfrom February to October inmild-winter areas, from April toJuly in cold-winter regions. Set6-in.-long pieces of rhizome onsoil at pool bottom or in boxes(not redwood ones, since thesecan discolor the water), placingrhizome in a nearly horizontalposition with its bud end up. Ineither case, top of soil shouldbe 8–12 in. below surface ofwater. Feed at planting time and monthly thereafter, using acontrolled-release product.Groom plants by removing spent leaves and blossoms. They usually bloom throughout warm weather and go dormant in fall, reappearing in spring. In very cold areas, protect plants by covering pond or by addingmore water to it.

Tropical kinds. These begin to grow and bloom later in summer but last longer, often until the first frost. Buy started tropical plants and set them at the same depth as hardy rhizomes. Tropical types go dormant but do not survive really low winter temperatures. Their best chance of long-term survival is in regions where orange trees grow. Where winters are colder, store dormant tubers in damp sand over winter or buy new plants each year.

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