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Ranunculus Inundatus (Ranunculus inundatus)
PlantRosette

Ranunculus Inundatus

Ranunculus inundatus

Eastern AustraliaIntermediate

TL;DR, Ranunculus Inundatus

Distinctive umbrella-shaped leaves on slender stems, unmistakable silhouette. Spreads via underground runners. Demands stable parameters and good light to produce the iconic umbrella form; under poor conditions reverts to simple paddle-shaped leaves. One of the most architecturally striking midground plants.

Ranunculus Inundatus (Ranunculus inundatus) is a rosette / runner aquatic plant for the midground of a planted tank. It reaches 5–15 cm under good conditions and grows at a medium rate. Light: medium to high. CO₂: recommended. Target 20–26 °C, pH 5.5–7.5, and 2–12 dGH. Substrate: Nutrient-rich substrate + root tabs. Propagate via runners.

  • LightMedium to High
  • CO₂Recommended

Care at a glance

Distinctive umbrella-shaped leaves on slender stems, unmistakable silhouette. Spreads via underground runners. Demands stable parameters and good light to produce the iconic umbrella form; under poor conditions reverts to simple paddle-shaped leaves. One of the most architecturally striking midground plants.

Updated 2 min read

Part of our complete guide to the planted aquarium.

Leaves yellowing, pitting, or new growth coming in pale or twisted? Work out what it’s short of in our plant deficiency guide.

Ranunculus Inundatus (Ranunculus inundatus)
Harry Rose from South West Rocks, Australia · CC BY 2.0Source
Ranunculus Inundatus (Ranunculus inundatus)
Harry Rose from South West Rocks, Australia · CC BY 2.0Source
Ranunculus Inundatus (Ranunculus inundatus)
Harry Rose from South West Rocks, Australia · CC BY 2.0Source
Ranunculus Inundatus (Ranunculus inundatus)
Harry Rose from South West Rocks, Australia · CC BY 2.0Source
Ranunculus Inundatus (Ranunculus inundatus)
Harry Rose from Dungog, Australia · CC BY 2.0Source

Hero photo by Harry Rose from South West Rocks, Australia · CC BY 2.0 · Wikipedia

Tank fit

The parameters that decide whether ranunculus inundatus fits in your tank.

Parameters

Temperature20–26 °C
15 °C20 °C25 °C30 °C
pH5.5–7.5
4.05.06.07.08.0
Hardness2–12 dGH
0 dGH5 dGH10 dGH15 dGH20 dGH25 dGH
Height5–15 cm
020406080
LightMedium to High
Low
Medium
High
CO₂Recommended
None
Optional
Recommended
Required
GrowthMedium
Slow
Medium
Fast
V. fast
FlowLow to Medium
Still
Low
Medium
High
V. high

Profile

Family

Ranunculaceae

Type

Rosette / Runner

Position

Midground

Substrate

Nutrient-rich substrate + root tabs

Propagation

Runners

Habitat

Boggy roadside pools of south-eastern Australia

Eastern Australia

Kit for this plant

Who it lives with

Tank-mate safety and the species this one is documented to thrive (or fail) alongside.

Pro tips

Hard-won lessons from the tank.

The single most architecturally distinctive midground plant. Plant 5–8 individuals in a cluster for visual impact. CO₂ is the difference between a plain stem plant and the umbrella showpiece — without it, this plant looks unremarkable. Pairs beautifully with iwagumi-style stone hardscape, where the umbrella silhouette mirrors the stone shapes.

Things to watch for

What can go wrong and how to spot it.

Things to watch for

Failure modes, in order of how dramatic the fix is.

Nutrition

Common deficiencies

Reverts to simple paddle leaves (no umbrella): insufficient CO₂ or light. Pale: iron + nitrogen. Stunted: nutrient-poor substrate.

Algae

Algae issues

The umbrella leaves can collect detritus if flow is too low. Direct gentle flow across the plant.

How to care for it

The practical routine, read top to bottom.

  1. Fertilization

    Heavy root feeder. Root tabs every 3–4 months essential. Iron and trace dosing. CO₂ strongly recommended — without it the plant produces only single-leaf shoots, never the iconic umbrella.

  2. Trimming

    Trim runners that escape intended boundary. Don't trim the umbrella leaves themselves — new umbrellas emerge from the base.

Background

Where it comes from, how it behaves, and the variants you'll see at retail.

Show background

In the wild

Where it lived before it came home.

See where the Ranunculus Inundatus and every other species comes from on the species world map.

Origin · Eastern Australia

Seasonal wetlands and stream margins across eastern Australia. Grows emersed during dry months, fully submerged during wet season.

Emersed form

Simple oval emersed leaves on tall stems. The famous 'umbrella' form is purely a submerged adaptation. Wholesale arrives emersed; transitions to umbrella form over 2–4 weeks under proper conditions.

Flowering

Yellow buttercup flowers emersed; never flowers submerged.

Variants & identification

The named cultivars and the lookalikes worth flagging.

Variants / cultivars

Only one form is sold in the hobby. Often confused with other aquatic Ranunculus species (R. lingua, R. flammula) which are temperate-pond plants and don't transition well to tropical aquariums.

Misidentification

Several other aquatic plants have similar umbrella shapes (Hydrocotyle leucocephala, Hydrocotyle tripartita) but are unrelated. Ranunculus has a single umbrella; the Hydrocotyles produce clusters of small round leaves.

Frequently asked questions

Direct answers to the questions search engines and AI assistants surface most often about this species.

Does Ranunculus Inundatus need CO₂?

CO₂ requirement: recommended. Light requirement: medium to high. Under low-tech conditions the plant grows at a medium rate.

What light level does Ranunculus Inundatus need?

Ranunculus Inundatus (Ranunculus inundatus) needs medium to high light. Run a photoperiod of 6–8 hours; longer photoperiods invite algae unless CO₂ and dosing are dialled in.

Where should Ranunculus Inundatus be planted?

Position: midground. Substrate: Nutrient-rich substrate + root tabs It typically reaches 5–15 cm.

How do you propagate Ranunculus Inundatus?

Propagation method: Runners. Ranunculus Inundatus is a rosette / runner plant.

What water parameters does Ranunculus Inundatus tolerate?

Target 20–26 °C, pH 5.5–7.5, and 2–12 dGH. Flow tolerance: low to medium.

Is Ranunculus Inundatus suitable for beginners?

Difficulty: 3/5. Intermediate, stable parameters and a mature tank matter.

Sources & further reading

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Adjacent specimens in the catalogue.

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Cross-references

Build the rest of the tank.

A planted tank is a system. Pair this plant with one entry from each other pillar to plan the whole scape.