Rorippa Aquatica

Quick facts

Identity

Also known as

Water Cabbage; Water Horseradish; Lake Cress; American Watercress

Synonyms

Armoracia aquatica; Neobeckia aquatica

Environment

Freshwater

Native to

United States

Habitat

Slow-moving streams, marshes, and pond margins, rooting in shallow water or floating, often in clear nutrient-rich water over sandy or silty substrate

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Moderate

Growth form

Rosette

Max height

2 – 4.7 in (5.1 – 12 cm)

Spread

6 in (15 cm)

Growth rate

Slow

Placement

Foreground, Midground

Water

Temperature

64 – 75 °F (18 – 24 °C)

pH

6.0 – 7.5

GH

2 – 15 dGH

dKH

2 – 14 dKH

PAR

30 – 60 PAR

Flow

Low-Moderate

Light

Medium

CO₂

Beneficial

Planting

Substrate

Nutrient-rich preferred

Feeds from

Both

Fertilizer needs

Medium

Colors

Green

Feeding & breeding

Propagation

Cuttings, Plantlets

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Care guide

Overview

Leaves span two to nearly five inches, ranging from deeply lobed, oak-like foliage underwater to rounder, simpler shapes when grown emersed, forming a spreading rosette for the foreground or midground. Cooler water in the upper 60s to low 70s, medium to high light, and CO2 keep growth dense rather than leggy. Shed leaves often root themselves, making propagation nearly automatic.

Care

Lake cress adapts to a fairly wide range of water chemistry but grows best in cooler water than many popular foreground plants, ideally in the mid to upper 60s to low 70s Fahrenheit. Leaf shape shifts dramatically with conditions, producing deeply lobed, almost fern-like foliage when fully submerged in strong light and CO2, and simpler, rounded or toothed leaves under lower light or emersed growth. Medium to high light brings out a denser rosette and helps prevent the plant from stretching, though it will survive under more modest lighting at a slower pace.

Planting & trimming

Plant the rosette with its crown at or just above the substrate line, since burying the growing point can cause rot, and space multiple rosettes a couple of inches apart to allow room for the leaves to spread. It can be grown emersed in a paludarium-style setup or fully submerged, and trimming is mostly limited to removing spent or melting outer leaves. Loose or floating detached leaves that develop plantlets can simply be pressed into the substrate to start new specimens.

Fertilizing

A nutrient-rich substrate benefits root development and supports steadier growth, and root tabs placed near the base of the rosette are useful in leaner setups. Liquid fertilization with iron and a full micronutrient mix helps maintain leaf color and compensates when substrate nutrients run low. Pale new growth or stalled leaf production usually points to insufficient iron or overall fertilization rather than a light problem.

Propagation

Propagation happens naturally as older leaves detach, float, and sprout small roots and plantlets from their margins, which can then be planted individually once they have a few roots. Stem or rosette cuttings can also be trimmed and replanted directly into substrate. Growth is slow to moderate, so new plantlets take some time to establish into full-sized rosettes.

Problems

Shedding of older leaves after purchase or transplanting is normal and not a sign of failure, since detached leaves commonly grow their own roots and become new plantlets. True melt can occur when a plant grown emersed is transitioned underwater, with soft tissue breaking down before new submerged-form leaves appear. Low light or poor CO2 stability can also slow recovery and invite algae on the older, slower-growing leaves.

Sources

1. Lake cress care: light, CO2 and placement · TankBud
2. Rorippa Aquatica – Water Cabbage Rosette Aquarium Plant – Aquarium Plants Factory
3. Rorippa aquatica - Ko-fi
4. Water Cabbage - Rorippa aquatica - Rooted | Aquatic Plants SA

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