Propagating Ranunculus papulentus (Australian Buttercup)

How to propagate Ranunculus papulentus by dividing its creeping rhizome and runners, with the cool-water, lateral-spreading conditions this Australian buttercup likes.

Overview

Ranunculus papulentus is an upright perennial herb, about 10-25 cm tall, that grows from underground stolons and has a rhizomatous habit which aids its spread. Its leaves carry a lamina 2-4 cm long with three primary segments, each with three to five lobes or teeth, on petioles 4-25 cm long, giving the bright green, buttercup-like look prized in cool planted tanks.

It is endemic to south-eastern Australia, living in freshwater wetlands on mud or in pools, and it spreads chiefly through its creeping rhizome and runners. In the aquarium it is emersed-capable and works best as a cool-water midground plant that fills space sideways.

Propagation Method

Propagation is vegetative: the plant throws runners and multiplies quickly, spreading laterally through its rhizome to fill its allotted space. Rather than topping a stem, you divide the rhizome and runner network, separating rooted nodes and replanting them as independent plants.

Step-by-Step

Let the plant settle and send runners out across the substrate.
Gently lift a spreading runner or a section of rhizome that carries rooted nodes.
Cut the rhizome between nodes so each piece has roots and at least one growth point.
Replant each division into nutrient-rich substrate, keeping the rhizome shallow and the roots covered.
Allow each piece to root and resume its lateral spread.

Conditions for Healthy Growth

Temperature: a cool-water lover, roughly 16-24 C, ideal for unheated planted tanks.
Lighting: medium light suits it; brighter light keeps growth compact.
CO2: not required, but added CO2 makes it grow very quickly.
Substrate: nutrient-rich substrate feeds the spreading rhizome.
Water: tolerant across pH 6-7.5 and GH 3-14, and it grows well even in low-tech, soil-based setups.

Maintenance

Because it spreads through runners and multiplies fast, the main job is keeping it within bounds. Every few weeks lift and divide runners that have wandered past their area, replant the best pieces to thicken the midground, and remove any old or yellowing leaves at the base.

Common Challenges

Overspreading: its vigorous runners will travel into neighbouring plants unless divided regularly.
Warm water: as a cool-water species it does best in unheated tanks and may struggle in consistently warm aquariums.
Identity confusion: it is closely tied to and sometimes treated as Ranunculus inundatus, so labelling and care notes can overlap.