Propagating Marsilea quadrifolia: Splitting the Clover Carpet by Runners

A guide to propagating Marsilea quadrifolia, a clover-shaped carpeting fern that spreads by a creeping rhizome and runners; divide and replant small portions to expand the lawn.

Overview

Marsilea quadrifolia is an aquatic fern whose four-parted leaves resemble a four-leaf clover, though it is not a true clover. Native across central and southern Europe and into Asia, it can grow submerged, semi-submerged or on wet soil, with leaves that float in deep water or stand erect in shallow water. In the aquarium it serves as a low, fern-ally carpet for the foreground.

Although in nature it can reproduce through spore-bearing sporocarps, in the aquarium it is propagated vegetatively: it spreads by means of runners and a creeping rhizome, so you increase it by dividing and replanting portions.

Propagation Method

Marsilea spreads across the soil surface by runners growing from a creeping rhizome. To propagate, lift a section, separate the rhizome into smaller portions each carrying a few leaves and roots, and replant those portions; each will continue creeping and send up new clover leaves.

Step-by-Step

Gently lift an established patch and rinse loose substrate from the rhizome.
Divide the creeping rhizome into small portions, each with several leaves and a section of root.
Replant each portion with tweezers, pressing the rhizome lightly into the substrate and leaving leaves above it.
Space the portions across the foreground so their runners can grow toward each other.
Be patient — growth is slow; the portions gradually join into a continuous low carpet.

Conditions for Healthy Growth

Marsilea is an easy, forgiving carpet that grows slowly. It can be used in low-tech tanks without injected CO2 and tolerates a little more shade than many carpets, so it suits lower light. That said, like all carpets it can thrive at low light as long as CO2 is sufficient, and it benefits from CO2 supplementation. Give it a nutrient-rich substrate, temperatures around 18-26 C and soft to moderately hard, near-neutral water.

Maintenance

Because growth is slow, maintenance is light — trim only every few weeks. Cut back overlong or older leaves at the base to keep the carpet flat and let light reach the runners, and remove leaves that detach so they do not foul the water.

Common Challenges

Very slow filling-in — normal for Marsilea; plant denser portions if you want a faster carpet.
Tall, leggy leaves — typically too little light; raise light to keep the plant low and compact.
Floating portions after planting — push the rhizome in firmly until roots anchor it.