10 flowering Australian natives for every zone of a water garden
Water lilies and lotus dominate ornamental water gardens in Australia for obvious reasons: they have large flowers, floating foliage and visual drama. But both are exotic plants that can become invasive in our waterways.
A native water garden can match the visual impact of a lotus or water lily planting and actively support the wildlife around it.
Australian native water plants include floating flowers that cover open water in white and yellow, large trumpet-shaped blooms at the margin, vivid purple iris-like flowers for the bog edge and tiny orchid-like blooms that emerge from one of the most ecologically extraordinary plants on the continent.
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The ten plants here are organised by the zone they occupy in and around a water garden.
1. Water snowflake (Nymphoides indica)
Zone: Open water — 10–40cm depth
Water snowflake leaves are kidney-shaped and dark green, similar in form to a small lily pad and the flowers are extraordinary: white with five fringed, almost crystalline petals. They are produced prolifically across the water surface through summer and autumn, individually short-lived but replaced continuously. It spreads by runners to cover the available water surface and suppress algae growth. It works well with other native pond plants including nardoo and water ribbons.
Water snowflake (Nymphoides indica) — fringed white flowers floating above kidney-shaped leaves, the most direct native alternative to a water lily for tropical and subtropical gardens.
In the garden
Plant in aquatic baskets filled with heavy clay loam, submerged to 10–40cm. It suits tropical and subtropical gardens year-round and temperate gardens through the warmer months. Divide congested clumps in spring by separating rhizomes with a hori hori.
2. Wavy marshwort (Nymphoides crenata)
Zone: Open water — 10–50cm depth
Wavy marshwort is the inland counterpart to water snowflake; a floating-leaf aquatic native to billabongs, waterholes and seasonal wetlands across the dry interior. The leaves are wavy-edged and slightly smaller than those of Nymphoides indica. The flowers are vivid yellow with five fringed petals, produced in clusters just above the water surface through summer. Its tuberous roots allow it to survive drying waterholes and reshoot when water returns, making it well suited to garden ponds where evaporation is a real challenge.
Wavy marshwort (Nymphoides crenata) — vivid yellow fringed flowers above wavy-edged floating leaves, a native of inland billabongs and seasonal waterholes.
In the garden
Plant in aquatic baskets in 10–50cm of water. Tolerates higher water temperatures than most aquatics. Divide in spring using a hori hori to separate the tuberous roots. Suited to all mainland states.
3. Swamp lily (Ottelia ovalifolia)
Zone: Open water to Marginal — 5–30cm depth
Large, three-petalled white flowers with yellow centres emerge on long stalks above the water surface and are produced singly but continuously through the warmer months. The submerged leaves are broadly oval and translucent, creating a beautiful underwater effect in clear water, while emergent leaves are broader. It performs best in nutrient-rich water with a muddy substrate.
Swamp lily (Ottelia ovalifolia) — large white flowers with yellow centres emerging above the water surface, the most lily-like of Australia's native aquatics.
Stitchingbushwalker, CC BY-SA 4.0, via Wikimedia Commons
In the garden
Plant directly into the pond substrate or in aquatic baskets in 5–30cm of water. Prefers still, warm, nutrient-rich conditions and protection from strong water movement. A hand fork is useful when dividing or repositioning to avoid damaging the fleshy roots.
Planting zones in a water garden
A well-designed water garden replicates the natural zonation of an Australian wetland: open water for submerged and floating plants, a shallow marginal shelf for emergent plants in 0–15cm of water and a bog edge zone of consistently moist but not waterlogged soil. Matching plants to the correct zone is the single most important factor in water garden success.
4. River lily (Crinum pedunculatum)
Zone: Marginal to Bog edge — moist to wet soil, tolerates periodic inundation
River lily produces some of the most dramatic flowers of any Australian native plant. Each stem carries eight to twenty individual flowers opening in sequence over several weeks through summer and autumn. The bold, strap-like foliage makes it a structural presence year-round — gardeners looking for similar strappy form and flower impact in drier positions may also find the agapanthus alternatives guide useful. It performs best at the water's edge rather than in standing water. The large bulb needs to breathe and will rot in permanently saturated conditions.
River lily (Crinum pedunculatum) — large clusters of fragrant white flowers on tall stems through summer and autumn, one of the most dramatic flowering plants for wet margins.
In the garden
Plant at the pond margin in moist, rich soil with the bulb neck just above the waterline. Divide large clumps every three to four years in late winter using loppers or a sharp spade to separate offset bulbs. Remove spent flower stems with sharp secateurs. Best suited to coastal QLD and NSW in frost-free positions.
5. Fairy aprons (Utricularia dichotoma)
Zone: Open water to Marginal — shallow water or permanently wet substrate
The flowers of fairy aprons are vivid purple with a distinctive two-lipped form resembling a tiny orchid, produced on slender stems in large numbers through spring and summer. Below the waterline, the plant produces tiny bladder-like traps that capture and digest microscopic aquatic organisms, making it a genuinely carnivorous aquatic. It requires very low nutrient levels.
Fairy aprons (Utricularia dichotoma) — vivid purple two-lipped flowers above the water surface, produced by a carnivorous aquatic that traps microscopic organisms below the waterline.
In the garden
Grow in a shallow container or dedicated low-nutrient pond in full sun. Use a sandy, nutrient-poor substrate or allow to float freely. Do not fertilise under any circumstances. Source from specialist carnivorous plant nurseries.
6. Angled lobelia (Lobelia anceps)
Zone: Marginal to Bog edge — moist to wet soil or very shallow water
Angled lobelia produces vivid blue to purple two-lipped flowers on branching stems through spring, summer and into autumn, and spreads by runners to form a colony along a water margin. It is one of the most useful transitional plants between the wet marginal zone and the damp soil beyond. The flowers are small individually but produced over such a long season that the plant provides consistent colour across the margin in a way few other plants can match.
Angled lobelia (Lobelia anceps) — vivid blue to purple flowers on spreading stems, one of the most reliable and long-flowering native marginals across a wide range of climates.
Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0, via Wikimedia Commons
In the garden
Plant at the pond margin in moist soil or very shallow water. Spreads readily so contain by trimming runners with sharp secateurs or a hori hori twice a year. Suited to all states except NT and arid inland.
7. Purple flag (Patersonia occidentalis)
Zone: Bog edge — moist to seasonally wet soil
Purple flag produces rich, saturated purple flowers in the form of a classic iris from a grass-like clump through spring and early summer. Each flower lasts only a day, but new flowers emerge continuously over a long season. It tolerates both waterlogged winter conditions and moderately dry summer soils, making it one of the most reliable bog-edge plants for the seasonal swing that is typical of most garden pond surrounds.
Purple flag (Patersonia occidentalis) — rich purple iris-like flowers above a grassy clump, one of the most visually striking bog-edge plants for southern Australian water gardens.
In the garden
Plant in moist to seasonally wet soil at the pond edge. Divide congested clumps in autumn with a hand fork to reinvigorate flowering. Remove spent stems with secateurs. Suited to VIC, TAS, SA, NSW and WA.
8. Water plantain (Caldesia parnassifolia)
Zone: Marginal — 0–15cm of water or permanently saturated soil
Water plantain produces elegant white three-petalled flowers on tall branching stems above large, heart-shaped leaves. The flowers are produced in whorls along each stem, creating a light, airy effect quite different from the bold solitary blooms of Ottelia or Crinum. A note on sourcing: Caldesia parnassifolia is listed as vulnerable in NSW and is difficult to find in cultivation. It is not stocked by mainstream aquatic nurseries so search specialist native plant nurseries, plant society sales or online specialist suppliers.
Water plantain (Caldesia parnassifolia) — delicate white flowers on tall branching stems, an elegant vertical accent for the marginal zone of a tropical or subtropical water garden.
I, KENPEI, CC BY-SA 3.0, via Wikimedia Commons
In the garden
Plant in aquatic baskets in 0–15cm of water or permanently saturated soil. Prefers warm, still, nutrient-rich conditions. Use a hand fork to handle the root zone carefully — the roots are fleshy and damage easily. Suited to tropical and subtropical QLD, coastal northern NSW and NT.
9. Swamp isotome (Isotoma fluviatilis)
Zone: Bog edge — moist to wet soil
Swamp isotome produces small, vivid blue star-shaped flowers across a spreading mat of fine, bright green foliage through spring and summer. It spreads by surface runners to form a dense, low groundcover that is one of the most effective living covers for the damp ground around a pond edge. It is one of the few genuinely blue-flowering plants available for this zone of a water garden and works beautifully between larger marginal plants as a gap-filler and weed suppressor.
Swamp isotome (Isotoma fluviatilis) — vivid blue star flowers across a spreading groundcover mat, one of the most visually distinctive plants for the damp soil at a pond's edge.
Stitchingbushwalker, CC BY-SA 4.0, via Wikimedia Commons
In the garden
Plant in moist to wet soil at the pond edge. Spreads readily — trim back runners with sharp secateurs to contain spread. A useful companion to purple flag and lobelia in the bog-edge zone. Suited to VIC, TAS, SA and highland NSW.
10. River buttercup (Ranunculus inundatus)
Zone: Marginal — 0–10cm of water or permanently saturated soil
River buttercup produces bright yellow five-petalled flowers above finely divided, fernlike floating or emergent leaves through spring and summer. The flowers are small — around 1cm across — but produced in generous numbers. The delicate leaf form makes it a useful textural contrast plant alongside the larger-leafed Ottelia or the strap leaves of Crinum. It is one of the easiest native aquatics to establish and maintain, tolerating a wide range of water depths, temperatures and nutrient levels.
River buttercup (Ranunculus inundatus) — small bright yellow flowers above finely divided floating leaves, a widely distributed native aquatic providing textural contrast in the marginal zone.
Harry Rose from South West Rocks, Australia, CC BY 2.0, via Wikimedia Commons
In the garden
Plant in aquatic baskets or saturated pond-edge soil in 0–10cm of water. Divide congested clumps in spring using a hand fork or hori hori. One of the best native aquatics for gardens across southern Australia and the wetter parts of the east coast. Pairs well with the structural plants covered in the pond and water features guide.
The problem with exotic water plants in Australia
Many of the most widely sold water garden plants in Australian nurseries are exotic species with documented environmental risks. Some are classified as Weeds of National Significance; a designation reserved for species causing severe and widespread ecological harm.
Water hyacinth (Eichhornia crassipes) — a Weed of National Significance still sold in some Australian nurseries, capable of doubling in size rapidly and devastating native wetland ecosystems.
| Plant | Category | Issue |
|---|---|---|
| Eichhornia crassipes — Water hyacinth | Weed of National Significance | One of the world's worst aquatic weeds. Forms dense floating mats that block light, deplete oxygen, displace native plants and collapse aquatic food webs. Banned in several states but still occasionally sold. |
| Pistia stratiotes — Water lettuce | Weed of National Significance | Fast-spreading floating plant that smothers water surfaces and eliminates habitat for native aquatic species. Illegal to sell or possess in several states. |
| Salvinia molesta — Salvinia | Weed of National Significance | Doubles in size every two to four days under ideal conditions. Has devastated wetlands across tropical and subtropical Australia. Illegal to possess in most states. |
| Myriophyllum aquaticum — Parrot's feather | Invasive — restricted | Spreads readily from garden ponds into natural waterways via fragments. Displaces native submerged aquatics and degrades water quality. Restricted in most states. |
| Nelumbo nucifera — Sacred lotus | Invasive in tropical areas | Widely sold as an ornamental. Spreads vigorously in tropical waterways, particularly in QLD and NT, where it can outcompete native aquatic vegetation. Not listed nationally but problematic in warmer climates. |
| Nymphaea hybrids — Exotic water lilies | Some forms invasive | Exotic and hybrid water lilies can naturalise in slow-moving waterways. They provide minimal habitat value for native insects, frogs and waterbirds compared to native aquatic plants. |
| Pontederia cordata — Pickerelweed | Exotic — limited wildlife value | North American origin. Increasingly sold in Australian nurseries as an ornamental marginal. Restricted in some states. Provides limited ecological value for Australian native fauna. |
| Thalia dealbata — Water canna | Exotic — limited wildlife value | North American origin. Increasingly common in nurseries and landscaping. Not currently listed as invasive in Australia but supports no native insects, frogs or waterbirds in the way native marginals do. |
A water garden that belongs here
A garden pond planted with Nymphoides, Ottelia and Crinum supports frogs, native bees, dragonflies and waterbirds in ways that a lotus or exotic water lily simply cannot. The bog-edge plants here pair naturally with the wet soil natives covered elsewhere on the site to create a complete planting from open water to garden. But beyond the wildlife argument, these plants are visually compelling on their own terms.
A native water garden actively supports frogs, dragonflies, native bees and waterbirds — wildlife that exotic water garden plants largely cannot attract or sustain.
They are genuinely excellent plants that happen to be native — and that, planted together, create a water garden that looks and functions as though it grew there, and that attracts birds and wildlife year-round.
keep reading
A Guide to Australian Native Gardening
How to plan, plant and care for a thriving native garden, whatever your experience level.
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