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.
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.
By Mike ElmiraUpdated 2 min read
Part of our complete guide to the planted aquarium.
Hero photo by Harry Rose from South West Rocks, Australia · CC BY 2.0 · Wikipedia
The parameters that decide whether ranunculus inundatus fits in your tank.
Ranunculaceae
Rosette / Runner
Midground
Nutrient-rich substrate + root tabs
Runners
Boggy roadside pools of south-eastern Australia
Eastern Australia
Tank-mate safety and the species this one is documented to thrive (or fail) alongside.
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.
What can go wrong and how to spot it.
Failure modes, in order of how dramatic the fix is.
Reverts to simple paddle leaves (no umbrella): insufficient CO₂ or light. Pale: iron + nitrogen. Stunted: nutrient-poor substrate.
The umbrella leaves can collect detritus if flow is too low. Direct gentle flow across the plant.
The practical routine, read top to bottom.
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.
Trim runners that escape intended boundary. Don't trim the umbrella leaves themselves — new umbrellas emerge from the base.
Where it comes from, how it behaves, and the variants you'll see at retail.
Where it lived before it came home.
Seasonal wetlands and stream margins across eastern Australia. Grows emersed during dry months, fully submerged during wet season.
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.
Yellow buttercup flowers emersed; never flowers submerged.
The named cultivars and the lookalikes worth flagging.
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.
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.
Direct answers to the questions search engines and AI assistants surface most often about this species.
CO₂ requirement: recommended. Light requirement: medium to high. Under low-tech conditions the plant grows at a medium rate.
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.
Position: midground. Substrate: Nutrient-rich substrate + root tabs It typically reaches 5–15 cm.
Propagation method: Runners. Ranunculus Inundatus is a rosette / runner plant.
Target 20–26 °C, pH 5.5–7.5, and 2–12 dGH. Flow tolerance: low to medium.
Difficulty: 3/5. Intermediate, stable parameters and a mature tank matter.
A planted tank is a system. Pair this plant with one entry from each other pillar to plan the whole scape.
