Water: The Foundation of a Wildlife-Friendly Yard
In many parts of the United States, especially across the Southwest, Great Plains, and other regions that experience hot, dry summers, water can be the single most important resource limiting wildlife. During periods of drought, even a simple birdbath with fresh, clean water can become one of the most valuable features you provide for birds and other animals.
If you have room for just one habitat feature in your yard, consider making it a pond or small water garden. It doesn't have to be large—even a shallow pool of water can make an enormous difference. A backyard pond quickly becomes a refuge for countless aquatic creatures while also creating a peaceful focal point that the whole family can enjoy.
A pond's value extends well beyond permanent water. Even seasonal ponds that dry out during part of the year play an essential ecological role. Although they won't support fish, temporary ponds provide ideal breeding habitat for many native insects and amphibians, whose eggs and larvae develop in the absence of fish predators. As spring rains or seasonal wet periods return, frogs, salamanders, dragonflies, diving beetles, and many other species rapidly colonize these temporary wetlands.
Whether your pond is a small seasonal basin or a larger, deeper water garden, adding water is one of the most rewarding ways to increase biodiversity in your landscape. Give it a try—you'll likely be amazed by how quickly wildlife finds it.
Temporary Ponds: Small Wetlands with a Big Ecological Role
One of North America’s most fascinating freshwater habitats is the seasonal pond, often called a vernal pool. Filled by autumn and winter rains or spring snowmelt, then drying during the warmer months, these wetlands follow the natural rhythm of many regions across the United States. From California’s Mediterranean climate to the forests of New England and the prairie potholes of the Upper Midwest, seasonal ponds appear and disappear with the seasons, creating habitats found nowhere else.
Creating a seasonal pond in your yard is surprisingly simple. Unlike a permanent pond, it does not need pumps or year-round water. A shallow basin placed where rainwater naturally collects can be enough. As the wet season begins, insects are usually the first to arrive. Water boatmen, diving beetles, mosquitoes, midges, and other aquatic insects quickly colonize the new habitat. Soon afterward come tiny freshwater crustaceans, amphibians, and countless microscopic organisms, many arriving as eggs or dormant stages carried by birds, mammals, wind, or flowing water.
As temperatures rise and the pond begins to shrink, wildlife responds in different ways. Flying insects simply move to nearby wetlands, while many other organisms survive by producing drought-resistant eggs or resting stages buried in the mud. These remarkable adaptations allow them to endure months of dry conditions until rain returns and the pond fills once again. Because fish cannot survive in ponds that regularly dry out, seasonal wetlands provide safe breeding habitat for countless species that would otherwise be vulnerable to fish predation. For many animals, these short-lived pools offer a rare ecological opportunity.
The changing water level also creates a constantly shifting plant community. Submerged aquatic plants dominate when the pond is deepest. As water recedes, floating-leaved species become more common, followed by emergent plants rooted in the mud. Many amphibians have synchronized their life cycles with this schedule. Species such as wood frogs, chorus frogs, spring peepers, spotted salamanders, and tiger salamanders must complete their larval development before the pond dries, making the timing of seasonal flooding essential to their survival.
Aquatic insects take advantage of every stage of the pond’s life. Some larvae hide among underwater vegetation, while others burrow into the soft sediment and feed on decaying organic matter. Dragonflies and damselflies spend months or even years underwater as predatory nymphs before climbing onto a plant stem, transforming into winged adults, and leaving the pond behind. Many other invertebrates spend only part of their lives in these wetlands, while others remain there from egg to adult.
Seasonal ponds also attract an impressive variety of visitors. Frogs and salamanders are often the stars of the show, but turtles may stop to forage, mammals frequently drink from the water’s edge, and birds quickly discover the abundance of insects and amphibians. Migrating shorebirds, ducks, and songbirds often pause at these temporary wetlands to rest and refuel during their journeys. Even though a vernal pool may hold water for only a few months each year, it can become one of the most biologically productive habitats in an entire landscape.
As a Seasonal Pond Dries
In a temporary pond, plants change with the water level. Fully submerged species dominate when the pond is deepest. As the water recedes, floating-leaved plants become more abundant, followed by emergent species rooted in the mud that continue growing after much of the water has disappeared.
Animal life follows the same seasonal rhythm. Amphibians such as wood frogs and spotted salamanders race to complete their life cycles before the pond dries, while many aquatic invertebrates survive the dry months as drought-resistant eggs or dormant stages buried in the sediment.
Myth vs. Reality
“A pond that dries up every year is a failed wetland.” “Permanent ponds are always better wildlife habitat than shallow seasonal pools.”
Seasonal ponds are among North America’s most valuable wildlife habitats.
Because they dry periodically, they usually remain free of fish, creating ideal breeding habitat for amphibians and many specialized aquatic invertebrates. In contrast, overly deep or poorly designed ponds can develop low-oxygen conditions, reduced water quality, and support fewer of the species that depend on temporary wetlands.
More Than a Reflective Mirror
Even if you choose a traditional backyard pond and want it to hold water year-round, it should be designed as more than just a decorative feature. Across the United States, natural wetlands have disappeared from much of the landscape, making even small backyard ponds valuable refuges for wildlife. A well-planned pond can provide food, shelter, and breeding habitat for a wide variety of native species instead of functioning as little more than a pool of water.
Gentle, Changing Shorelines
Seasonal changes in water level are completely natural and can actually improve wildlife habitat. As the shoreline shifts, damp soil becomes home to countless small creatures. Native aquatic insects, including many dragonflies and damselflies, lay their eggs in these shallow margins, while snails, ground beetles, spiders, and other invertebrates forage along the moist edge.
Rather than building steep banks, create broad, gently sloping shorelines that remain wet as water levels rise and fall. These transition zones are among the most biologically productive parts of any pond.
Keep It Shallow
Most pond wildlife lives surprisingly close to the surface. The greatest diversity of aquatic plants and animals is usually found in water less than about 4 inches (10 cm) deep, while much deeper areas often support fewer species.
Your pond does not need to be uniformly shallow, but it should include extensive shelves and gently graded edges instead of dropping off abruptly. Many aquatic insects breathe at the water's surface, making these shallow margins especially important. Small, temporary depressions that fill after rain can also provide excellent habitat for insects and amphibians.
Did you know?
North America's Eastern Tiger Salamander (Ambystoma tigrinum) is one of the continent's largest native salamanders. During the breeding season, adults migrate to fish-free ponds and seasonal wetlands to reproduce.
Controlling Mosquitoes the Right Way
Mosquitoes are often a concern for new pond owners, but introducing fish solely for mosquito control is usually not the best solution.
The eastern mosquitofish (Gambusia holbrooki), is native to parts of the southeastern United States but has been widely introduced elsewhere, where it has harmed native fish and amphibians. In many regions, stocking mosquitofish—or any fish—in a backyard wildlife pond is discouraged because they readily consume amphibian eggs, tadpoles, aquatic insects, and other wildlife.
Instead, encourage a healthy, balanced ecosystem. Dragonfly and damselfly larvae, diving beetles, backswimmers, and many other native aquatic predators consume large numbers of mosquito larvae. Keeping water circulating gently, avoiding nutrient pollution, and maintaining diverse native vegetation will naturally reduce mosquito populations.
If mosquitoes become a serious public health concern, consult your local mosquito control district or Cooperative Extension office before using any treatment.
When native aquatic plants become established around the shoreline and within the pond, beautiful damselflies and dragonflies will usually arrive on their own. The blue damselflies shown here are typical of the many species that breed in healthy North American ponds. Their aquatic young, called nymphs, spend months—or even years—underwater before emerging as winged adults, where they become some of the most effective natural predators of mosquitoes and other small flying insects.
A Pond That Works Year-Round
The truth is that most fish and amphibians are not ideal neighbors in a small backyard pond. Many fish readily eat amphibian eggs and tadpoles, making it difficult for both groups to thrive together. Fortunately, a thoughtful pond design can solve much of this problem. By creating separate shallow and deep areas—and using native emergent plants such as soft rush, pickerelweed, or bulrush as natural barriers—you can provide fish with one section of the pond while giving frogs and salamanders safer breeding habitat elsewhere.
The same concept can also help separate different groups of amphibians when needed. Larger salamanders, for example, may prey on the eggs or larvae of frogs if they share the same breeding pools. Distinct habitat zones reduce these conflicts and allow a greater diversity of wildlife to flourish.
Introducing Plants and Wildlife
Once the pond is built, the most rewarding stage begins: watching it come alive.
Finding native aquatic plants at large garden centers can sometimes be difficult, but that does not justify collecting plants from nearby wetlands, ponds, or streams. In many places, removing native plants from public lands is illegal and can damage fragile ecosystems. Instead, purchase plants from reputable native-plant nurseries or obtain divisions from friends who already maintain healthy wildlife ponds.
Adding animals requires even more caution. Many amphibians, reptiles, and other aquatic species are protected by law, and moving them between locations can spread diseases such as chytrid fungus or introduce invasive parasites. Rather than stocking the pond yourself, allow wildlife to discover it naturally. Aquatic insects often arrive within weeks, while frogs, toads, salamanders, turtles, dragonflies, and other visitors may appear over the following months or years, depending on your region.
Patience almost always produces a healthier, more balanced pond ecosystem.
Plants Are the Foundation
Aquatic plants are the most valuable component of any wildlife pond. Beyond their beauty, they provide shelter, breeding sites, shade, oxygen, and food for countless species.
Choose plants native to your region whenever possible. Even if you do not plant every species yourself, many native wetland plants will establish naturally as seeds are carried by birds, wind, or water.
Open water is equally important. Fish, diving beetles, dragonfly larvae, and many amphibians all require areas free of dense vegetation. Aim for a mix of open water, floating vegetation, submerged plants, and emergent plants to create a variety of microhabitats that support the greatest diversity of wildlife.
Keep an eye on excessive algae growth. Algal blooms usually indicate an imbalance caused by abundant sunlight combined with excess nutrients from lawn fertilizer, decomposing organic matter, or runoff. Filamentous algae, in particular, can quickly dominate a small pond if nutrient levels become too high. Maintaining plenty of native plants, minimizing nutrient inputs, and preserving a balance of sun and shade will help keep algae under control without the need for chemicals.
The Plant Structure of a Backyard Wildlife Pond
Aquatic plants are the foundation of a healthy backyard pond. Beyond adding beauty, they create shelter for wildlife, improve water quality by absorbing excess nutrients, produce oxygen, and divide the pond into a variety of miniature habitats. A well-planted pond supports everything from dragonflies and frogs to native bees, butterflies, and songbirds.
Different plants thrive in different parts of the pond. Choosing species adapted to each water depth creates a balanced ecosystem while providing year-round interest.
Plants for Different Pond Zones
Floating-leaved plants
These species root in the pond bottom while their leaves float on the surface, providing shade that helps keep the water cool and discourages excessive algae growth.
- American white water lily (Nymphaea odorata)
- Fragrant yellow pond-lily (Nuphar advena)
- Water buttercup (Ranunculus aquatilis) in regions where it is native
Submerged oxygenating plants
These underwater plants release oxygen during photosynthesis, compete with algae for nutrients, and provide cover for fish, tadpoles, and aquatic insects.
- Watermilfoil (Myriophyllum spp., using native species only)
- Coontail (Ceratophyllum demersum)
- American pondweed (Potamogeton nodosus) and other native pondweeds
Shallow-water (marginal) plants
Growing in just a few inches of water, these species stabilize pond edges and provide nectar, pollen, and nesting sites for wildlife.
Blue flag iris (Iris versicolor) in the East and Midwest. The elegant blue flag iris is one of North America's finest native pond plants. Its striking blue-violet flowers bloom from late spring into early summer, attracting bumble bees and other native pollinators. Unlike many ornamental irises, native blue flag species are well adapted to natural ponds and rain gardens, thriving in shallow water or saturated soils while helping stabilize the shoreline.
Western blue flag (Iris missouriensis) in parts of the West
Broadleaf arrowhead (Sagittaria latifolia)
Pickerelweed (Pontederia cordata)
Soft rush (Juncus effusus)
Sweet flag (Acorus americanus)
Moist shoreline plants
These species thrive in consistently damp soil around the pond, softening the transition from water to garden.
- Cardinal flower (Lobelia cardinalis)
- Great blue lobelia (Lobelia siphilitica)
- Joe-Pye weed (Eutrochium spp.)
- Monkeyflower (Mimulus ringens)
- Marsh marigold (Caltha palustris) where native
- Native mint species (Mentha spp.)
From Blueprint to Backyard: Building Your Wildlife Pond
Once your family is on board, you’ve checked local regulations, and your neighbors understand that a healthy pond is more likely to attract frogs and songbirds than become a nuisance, it’s time to get started. With a little planning and determination, your backyard can soon become a thriving habitat for wildlife.
Let’s Build the Pond!
You’ll need:
- Waterproof boots and outdoor work clothes
- Biodegradable landscape marking paint
- Shovels and a digging spade
- Protective pond underlayment or old newspapers/cardboard
- EPDM pond liner
- Large rocks and boulders
- Garden hose
- A few helping hands
Before breaking ground, think carefully about where the pond will go. A location that receives about 4–6 hours of direct sunlight each day is ideal. Too much sun can encourage algae growth, while deep shade limits aquatic plant growth and reduces activity from pollinators and other wildlife.
If your yard has native shade trees nearby, they can help create a good balance. Some fallen leaves are beneficial because they contribute organic matter, but excessive leaf litter should be removed each autumn to keep the pond healthy.
Choose a location that is easy to enjoy from your house or patio while still providing a quiet refuge for wildlife. Rather than using a perfectly round outline, design the pond with gentle curves and an irregular shape so it blends naturally into the landscape.
1. Mark and Excavate
Outline the pond with biodegradable marking paint or a garden hose before digging. As you excavate, set aside the nutrient-rich topsoil so it can be reused later when landscaping around the pond.
Create gently sloping sides that allow birds, amphibians, and beneficial insects to enter and leave safely. For a typical backyard wildlife pond, a deepest point of 18–24 inches (45–60 cm) provides adequate water depth while remaining easy to maintain.
2. Prepare the Hole
Once excavation is complete, carefully remove all rocks, roots, and sharp objects that could puncture the liner.
Before installing the liner, cover the entire excavation with a protective underlayment. Commercial pond underlayment is ideal, but several layers of old newspapers or plain cardboard also work well and help cushion the liner from stones and roots.
3. Install the Pond Liner
If you are cutting the liner before installation, remember that it must be much larger than the finished pond to allow for the depth and gently sloping sides.
For example, a pond measuring 10 × 16 feet and about 20 inches deep will typically require a liner approximately 13 × 20 feet.
For long-lasting performance, choose a high-quality EPDM rubber liner, which is the standard recommendation for wildlife ponds in North America because of its durability, flexibility, and long service life. High-quality polyethylene liners are another option, though they generally do not last as long as EPDM.
4. Add the finishing touches and fill the pond
Spread a thin layer of the excavated soil—about 1–2 inches (2.5–5 cm)—over selected areas of the liner, especially where you plan to establish aquatic plants. Bury the liner edges securely around the perimeter and cover them with rocks, logs, or native stone to create a natural-looking shoreline. Once everything is in place, begin filling the pond slowly with water.
5. Let the water settle, then add native plants
If you're filling the pond with municipal tap water, allow it to sit for a day or two so chlorine or chloramine treatments can dissipate or be neutralized before introducing wildlife. (If your utility uses chloramine, use a wildlife-safe water conditioner.)
After the water has settled, begin planting:
- Submerged and floating native aquatic plants directly in the pond.
- Native emergent plants such as pickerelweed (Pontederia cordata), soft rush (Juncus effusus), arrowhead (Sagittaria latifolia), or blue flag iris (Iris versicolor) around the shallow margins.
Surround the pond with native grasses, sedges, wildflowers, shrubs, and stones to blend it naturally into the landscape.
6. Let nature take over
The hardest work is finished. Now the best part begins: waiting.
Within days or weeks, the pond will begin attracting its first visitors. Aquatic insects such as water boatmen, backswimmers, diving beetles, dragonflies, damselflies, and water scavenger beetles often arrive by flight without any help. Soon afterward come frogs, toads, songbirds, butterflies, native bees, and many other animals seeking water, food, or breeding habitat.
Resist the temptation to stock the pond with fish. A fish-free pond supports a much richer diversity of amphibians and aquatic invertebrates and quickly develops into a thriving miniature wetland.
Keeping Your Wildlife Pond Healthy
How you care for your pond will largely determine the diversity and abundance of wildlife it supports. Although every pond is different, these general guidelines apply throughout much of North America.
Control overly aggressive plants
Native aquatic plants are essential, but some species can spread until they dominate the entire pond. This is a natural process, yet occasional maintenance keeps the habitat more diverse.
Late fall or winter is the best time to thin excessive growth. Pull out surplus vegetation by hand rather than using herbicides, and leave the removed plants beside the pond for a day so any insects, snails, or amphibians can crawl back into the water before composting the material.
Filamentous algae may also appear, especially in nutrient-rich water. Small amounts are beneficial, but heavy blooms can smother other life. Twirling algae around a stick or rake often removes it effectively. The long-term solution is reducing nutrient inputs by keeping fallen leaves, lawn fertilizer, pet waste, and grass clippings out of the pond.
Remove excess sediment when necessary
Over time, leaves and organic debris slowly accumulate on the bottom, gradually making the pond shallower.
Regularly skimming leaves from the surface and trimming dead vegetation slows this process, but every several years the pond may benefit from cleaning. The ideal time is during winter dormancy. Lower the water level if necessary, remove only part of the accumulated muck, and carefully rescue any insects, tadpoles, salamanders, snails, or other small creatures you encounter before replacing them in the pond.
Avoid removing all of the sediment at once, since much of the pond's wildlife overwinters there.
Prevent invasive aquatic plants
Never introduce ornamental aquatic plants without verifying that they are native or non-invasive in your region.
Many plants once sold for water gardens have escaped into natural wetlands and caused serious ecological damage. Depending on your location, invasive species may include:
- Hydrilla (Hydrilla verticillata)
- Eurasian watermilfoil (Myriophyllum spicatum)
- Parrot feather (Myriophyllum aquaticum)
- Water hyacinth (Eichhornia crassipes)
- Yellow floating heart (Nymphoides peltata)
These species form dense mats that crowd out native vegetation, reduce oxygen levels, and provide poor habitat for wildlife. If they appear, remove them promptly before they spread.
Repair leaks promptly
If the pond consistently loses water beyond normal evaporation, inspect it carefully for leaks.
First rule out seasonal water-level changes caused by heat and dry weather. If a leak is suspected, allow the water level to stabilize—the leak is often located at that height. Small punctures in flexible pond liners can usually be repaired with liner patch kits designed for EPDM or PVC pond liners.
A well-maintained wildlife pond requires surprisingly little work. With occasional care and plenty of patience, it will become increasingly rich in native plants, insects, amphibians, birds, and other wildlife year after year.
A Miniature Ecosystem
Studying the web of relationships that develops among the plants and animals in a backyard pond reveals many of the fundamental principles of ecology. Who eats whom? Which species occupy the top of the food chain? Why is virtually nothing wasted in a healthy pond? Even a small water garden can function as a complete, self-sustaining ecosystem, where every organism plays a role.
1. Water Strider
Closely related to the familiar water striders that skate across the surface of ponds, these tiny insects are agile predators. They detect the ripples made by struggling prey and quickly seize small insects trapped on the water’s surface.
2. Dragonflies and Damselflies
The aquatic nymphs of dragonflies and damselflies are among the pond’s most efficient hunters. They stalk mosquito larvae, tadpoles, and other aquatic creatures with remarkable speed, making them fascinating to watch. The adults, on the other hand, spend their lives in the air, where they patrol the garden in search of flying insects. Dense stands of native emergent plants provide ideal places for females to lay eggs and for newly emerged adults to climb from the water before taking flight.
3. Green Frog
The Green Frog (Lithobates clamitans), one of the most widespread frogs in eastern North America, is a frequent visitor to backyard ponds. It often announces its presence with its distinctive banjo-like call before you spot it resting among shoreline vegetation. In western North America, comparable native frog species fill the same ecological role.
4. Giant Water Bug
Often called a “toe-biter,” the giant water bug is one of the pond’s top predators. Equipped with powerful grasping front legs and a piercing beak, it captures insects, tadpoles, small fish, and even young frogs. Although it breathes atmospheric air through a snorkel-like tube at the tip of its abdomen, it spends most of its life submerged, waiting in ambush.
5. Backswimmer
Backswimmers swim upside down just beneath the water’s surface, using long hind legs like oars. Excellent fliers, they are often among the first aquatic insects to colonize newly established ponds. They prey on mosquito larvae and other small aquatic animals.
6. Diving Bell Spider
North America’s native diving bell spiders create underwater retreats by trapping air within silk structures attached to submerged vegetation. Like all spiders, they breathe air, carrying bubbles with them beneath the surface and periodically replenishing their underwater “diving bell.
7. Ramshorn Snail
Ramshorn snails are common inhabitants of wildlife ponds throughout North America. Their flat, coiled shells resemble the curled horn of a ram. Rather than harming healthy plants, they feed primarily on algae, decaying vegetation, and other organic debris, helping recycle nutrients within the pond.
8. Mayflies
With their distinctive long tail filaments, mayflies spend most of their lives as aquatic nymphs before emerging as delicate flying adults. Their adult stage lasts only a short time, making late spring and summer evenings the best opportunity to watch them rise from the pond's surface in graceful swarms.
9. Whirligig Beetles
These shiny black beetles glide rapidly in groups across the water's surface. If disturbed, they instantly dive beneath the water to escape predators. Look closely and you'll discover one of nature's unusual adaptations: their divided eyes allow them to see both above and below the water at the same time.
10. Predaceous Diving Beetles
Adult diving beetles are sleek, streamlined swimmers, but their larvae are even more formidable. Often called "water tigers," these fierce hunters feed on aquatic insects, tadpoles, mosquito larvae, and other small animals. A healthy pond frequently supports several species.
11. Newts
In many parts of the United States, eastern newts or rough-skinned newts may eventually discover a well-established wildlife pond. Their life cycle is remarkable, with aquatic larvae, a juvenile stage that often lives on land, and adults that return to the water to breed. Providing rocks, logs, native vegetation, and undisturbed shelter nearby makes it more likely these secretive amphibians will thrive.
12. Freshwater Isopods
These small crustaceans scurry rapidly through submerged leaf litter and decaying plant material. Although easy to overlook, they play an important ecological role by breaking down organic matter and helping recycle nutrients within the pond ecosystem.
13. American Green Treefrog
One of the greatest rewards for any wildlife gardener is hearing treefrogs calling from a pond they helped create. During the breeding season, adults gather to sing, and later you may spot newly transformed young frogs leaving the water. Their tiny size and bright green or yellow-green color make them easy to recognize as the next generation begins exploring the surrounding garden.
A backyard pond is far more than a decorative feature. Predators such as dragonfly nymphs, giant water bugs, and backswimmers help regulate insect populations, while snails and countless microorganisms recycle dead organic matter. Frogs connect the aquatic and terrestrial worlds, and native aquatic plants provide shelter, oxygen, and breeding sites. Together these interactions create a balanced food web in which energy and nutrients continually circulate, making even the smallest pond a thriving ecosystem in miniature.
