Marsilea Hirsuta

Quick facts

Identity

Also known as

Hairy water clover; Australian water clover; Pepperwort; Nardoo

Synonyms

Marsilea sp. "Four Leaf Clover"

Environment

Freshwater

Native to

Australia

Habitat

Seasonally flooded grasslands, wet meadows, pond and creek margins, and temporary pools that flood in wet season and dry out later

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Easy

Growth form

Carpeting

Max height

0.8 – 4 in (2 – 10 cm)

Growth rate

Slow

Placement

Foreground, Carpet

Water

Temperature

64 – 82 °F (18 – 28 °C)

pH

5.5 – 7.5

GH

2 – 15 dGH

Flow

Low-Moderate

Light

Medium

CO₂

Beneficial

Planting

Substrate

Nutrient-rich preferred

Feeds from

Roots

Fertilizer needs

Medium

Colors

Green

Feeding & breeding

Propagation

Rhizome division, Runners

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Care guide

Overview

Small four-lobed leaves resembling miniature clovers spread low across the foreground, creeping via horizontal rhizomes into a dense mat. Sold emersed, it needs several weeks to convert to its rounded submerged form before carpeting begins in earnest. Root feeding and medium-high light keep growth compact rather than tall and grass-like.

Care

Marsilea hirsuta is one of the easier carpeting plants to keep, tolerating a wide range of light levels though it forms the tightest, lowest carpet under medium to high light. It is usually sold in its emersed clover form and needs two to four weeks to convert to the low, rounded submerged leaves typical of the aquarium form. CO2 injection is not required but speeds fill-in and keeps the carpet shorter and denser, while low light causes taller, grass-like single-leaf shoots instead of the clover shape.

Planting & trimming

Divide the emersed, potted plant into several small clumps and press the rhizome sections shallowly into the substrate a couple of centimeters apart, leaving the growing tips uncovered. The rhizome creeps horizontally along the substrate surface, so avoid burying it too deep or growth will stall. As the plant establishes and old emersed leaves die back, trim them away and periodically trim taller shoots to push the carpet toward a denser, lower clover form.

Fertilizing

Roots are the main nutrient pathway, so a nutrient-rich substrate or regular root tabs matter more than heavy liquid dosing. Iron and trace element supplementation helps maintain a compact clover form and deeper green color. Pale new leaves usually point to iron deficiency, while stunted growth after initial establishment often signals depleted substrate nutrients that root tabs can correct.

Propagation

Marsilea hirsuta spreads through creeping rhizomes that send up new leaves at intervals, and sections of rhizome with a few leaves can be cut and replanted elsewhere to start new patches. Runners naturally fill in bare substrate over time without intervention. In nature and occasionally in aquariums it also produces spores from sporocarps, but vegetative division is the practical method for propagation in the hobby.

Problems

The main issue is the emersed leaves dying back during the transition to the submerged form, which is normal and simply requires trimming away the old growth as new low leaves emerge. Insufficient light keeps the plant in a tall, sparse grass-like phase rather than forming a dense carpet, so regular trimming of these taller shoots encourages spread and clover-shaped leaves. Algae rarely troubles it thanks to its smooth leaf surface, though slow growth means competing algae can get a foothold in poorly maintained tanks.

Sources

1. Marsilea hirsuta - Tropica Aquarium Plants
2. Marsilea hirsuta | Aquasabi - Aquascaping Shop
3. Four-Leaf Clover (Marsilea hirsuta) Care & Tank Mates, Fin & Stem
4. Dwarf four-leaf clover (Marsilea hirsuta) - Scale & Stem

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