9. Plants

9. Plants

USDA Planting Zone Map

For the avid water gardener, cultivating aquatic plants is an enduring pastime and a source of endless pleasure and satisfaction. Our aquatic nursery is teeming with hundreds of species of the most popular and successful varieties of hardy and tropical water garden plants. We’ve prepared an overview of our plant selections along with brief descriptions of how to plant and care for them to help you choose the right plantings for a beautiful, thriving water garden.


Hardy Water Lilies This is the group of water garden show-offs that makes water gardening so popular. Heart-shaped floating leaves are excellent for covering the water surface to provide shade and hiding places for goldfish and koi. Nodding just out of the water, graceful flowers, available in both single and double flowering varieties, range in color from white to the deepest of reds. These hardy plants are the staple of any water garden and overwinter to reappear in early spring and flower into the fall months. The stem of the hardy water lily is actually a tuber which assumes a horizontal growth habit and which gives rise to leaves and flowers. The petioles of the leaves adapt to a variety of water depths - up to 36” but most commonly 18-24” - bringing leaves to the surface to bask in the sun. The multi-petaled flowers open as the sun rises and close as evening approaches, lasting anywhere from two to four days each. Multiple flowers may appear at the same time. Most hardy water lilies do best with a minimum of 4 hours full sun but will also perform fairly well in partial shade.


Feed monthly with Fertilizer Tablet, TWG2714. As winter approaches, simply remove all stems, leaves and flowers and drop the pot to the deepest level in the pond and wait for spring. Repot when the plants become crowded or cease flowering.

			Tropical Water Lilies So named because of their penchant for the tropics, these lilies make a spectacular show for the water garden. Surrounded by large, mottled leaves, their brilliantly colored flowers are held distinctively above the surface of the water. Most are quite fragrant and flower more profusely than hardy lilies. With the exception of the southernmost regions of the United States, where they flourish year-round, tropical water lilies can be considered annuals in areas above Zone 8. Tropical lilies, however, can be preserved and planted again in the spring for many, many seasons. Tropicals are loosely separated into day bloomers and night bloomers. Day bloomers generally open in late morning and close in the early evening displaying color ranges from orange to blue to purple and white. Night bloomers begin to open in the evening and close in mid to late morning with blossoms of pink and white. Flowers usually last 3 to 4 days. The large leaves provide insulation from mid-afternoon heat keeping water temperatures more comfortable for fish and other pond dwellers and reducing light to nuisance algae.


This lovely group requires air temperatures of 80°F, a planting depth of at least 18” and a minimum of 4 hours of sunlight per day. Feed monthly with Fertilizer Tablet, #TWG2714. Tropical lilies require winter care in climates above Zone 8. See Tropical Lily Care, Solution 10d for specific winterizing of your tropical lilies.

Lily-Like Aquatics This group of aquatics encompasses a wide variety of species having a growth habit similar to the hardy lilies. Typically, leaves are floating and flowers are present above the water surface. A number of species produce lovely, fragrant flowers and their leaves are excellent surface cover and hiding places for fish. These plants can be either potted or allowed to roam but require occasional pruning to see that roots and stems do not clog intakes and filters. Available in both hardy and tropical varieties, these plants are nice additions to any water garden.

			Lotus These towering beauties are the true exotics of the water garden. The round, cupped leaves, sometimes reaching diameters of 24”, and striking flowers are held high above the water on sturdy stems and may reach heights of six feet. Flowers and leaves alike follow the direction of the sun. The distinctively veined leaf repels water and water droplets can often be seen dancing about on the surface. Flowers, available in single and double flowering varieties, range in color from white, pink and yellow and are faintly fragrant. The Momo Batan Lotus is a favorite deep pink dwarf variety, only reaching an average height of 2 feet. The center of the lotus flower is often seen in dried arrangements and other flower parts are used in Asian cooking.


Lotus, robust and hardy, is propagated in early spring and fall. Similar to the hardy lilies, the lotus stem is actually a fleshy tuber with an active growing tip from which flowers and leaves emerge. It is from these active segments of the tuber that new plant material is propagated. Separation is made between the segments, cutting slightly behind the indentation, and the actively growing end is placed in a large pot with the growing tip angled upward. The new cuttings are held in place with heavy clay soil and gravel and placed in a deep section of the pond.

Oxygenating Plants Oxygenating plants are so named because they live submerged under the water surface and release their photosynthetic by-product, oxygen, into the water keeping it richly supplied with this vital gas. In addition to oxygen production, this interesting group of plants plays an important role in the control of nuisance algae by more effectively competing for nutrients. Most oxygenating plants display an abundance of leaves, though reduced in size, on long, flowing stems. The three most notable species for the garden pond are Elodea (Anacharis), Cabomba and Hornwort. As members of the flowering plant group, Angiosperms, oxygenators produce flowers which may be visible or inconspicuous depending on the species.


Oxygenating plants are usually available in bunches and the pond should be stocked with 1 bunch, or 7-10 stems, for every gallon of water. They may be potted or allowed to roam but care must be taken to ensure that roots and stems do not clog intakes and filters. Occasional pruning and removal of dead and decaying plant material helps keep the plants vigorous and the pond crystal clear.

			Floating Plants The most notable examples of floating plants are Water Hyacinth, Salvinia, Water Lettuce, Azolla and Duckweed. Though its flower is very inconspicuous, Duckweed is the smallest member of the flowering plant family. Water Hyacinth, a nuisance plant in more tropical regions of the United States is a favorite with water gardeners above Zone 9 for is lovely foliage and showy cluster of purple flowers. The dangling root systems of Water Hyacinth and Water Lettuce also act as a filtering system collecting debris from the pond and help keep the water clear and clean. Floating plants are excellent choices to add variety to the surface and provide shade and hiding places for fish.

Hardy and Tropical Shallow Water Plants Adapted to the shallow, damp margins of the pond, this plant group adds interest and variety to the pondscape. Many flowering and nonflowering hardy and tropical varieties are available in just about very conceivable height and growth form. They range in height from the low growing, creeping types that grow over the water surface, to the tall, stately iris and papyrus grasses that make a striking planted background at pond’s edge. Tropical species can be purchased each season or overwintered in a frost-free area and reintroduced to the pond once daytime temperatures begin to reach the mid-70’s. Many nurseries make no distinction between shallow water plants and moisture-loving perennials.

USDA Planting Zone Map