Rotala Wallichii

Quick facts

Identity

Also known as

Whorled Rotala; Pink Rotala

Environment

Freshwater

Native to

India, Thailand, Vietnam, Laos, Southern China

Habitat

Marshes, rice paddies, ditches, and slow-moving acidic ponds and streams in lowland and hilly areas of Southeast Asia

Sourcing

Both

Conservation

Not Evaluated

Care

Care level

Difficult

Growth form

Stem

Max height

4 – 12 in (10 – 30 cm)

Spread

4 in (10 cm)

Growth rate

Fast

Placement

Midground, Background

Water

Temperature

70 – 82 °F (21 – 28 °C)

pH

5.5 – 7.0

GH

2 – 6 dGH

dKH

0 – 4 dKH

PAR

60 – 100 PAR

Flow

Low-Moderate

Light

High

CO₂

Required

Planting

Substrate

Nutrient-rich required

Feeds from

Both

Fertilizer needs

High

Colors

Pink, Orange, Red, Green

Feeding & breeding

Propagation

Cuttings

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Care guide

Overview

Whorled rotala is a fine-leaved stem plant from Southeast Asian marshes and rice paddies, prized for the needle-thin foliage that radiates in tight whorls along each stem. Under strong light and CO2 the growing tips shift through pink, orange, and magenta, though lower leaves shed readily if inputs lapse. Best kept in mature, heavily dosed setups rather than beginner tanks.

Care

Whorled rotala ranks among the more demanding stem plants in the hobby, needing strong lighting and a steady supply of pressurized CO2 to hold its form. Without those inputs the fine whorled leaves near the base tend to thin out and drop, leaving bare lower stems even as the tips keep growing. Because of this it suits established, well-dosed tanks rather than a first planted aquarium. Soft, slightly acidic water helps keep growth even and prevents the stunting that occurs in harder, alkaline conditions.

Planting & trimming

Plant stems individually with roughly half an inch of spacing rather than in tight clumps, since crowded stems shade each other and cause the inner growth to die back. Top-prune and replant the cuttings every three to four weeks, as the newest growth tips hold the best color while the older lower stems eventually need to be replaced entirely. Grouping ten or more stems together produces the densest and most attractive display.

Fertilizing

This plant is a heavy feeder, particularly of iron and other trace elements, which are best dosed through the water column since the fine leaves absorb nutrients readily from the surrounding water as well as the substrate. A nutrient-rich active soil substrate supports strong root growth and helps buffer pH downward. Keep nitrate present but low and phosphate on the higher side, since this combination favors intense pink and red coloration while limiting algae growth on the delicate foliage.

Propagation

Propagation is done by cutting the top or lateral shoots and replanting them directly into the substrate. Cuttings root quickly and resume upward growth within days under stable conditions, making this the standard way to renew stock as older stems decline.

Problems

Under insufficient light or CO2, the lower portions of the stems shed their needle-like leaves and the plant declines from the bottom upward, a common failure mode for this species. The fine foliage also traps detritus easily and can attract algae if nutrient dosing is inconsistent. Amano shrimp and other algae-grazing tankmates sometimes nibble the tender young leaves when other food is scarce.

Sources

1. Rotala wallichii - Tropica Aquarium Plants
2. Rotala wallichii - Flowgrow Aquatic Plant Database
3. Rotala wallichii (Rotala wallichii) - Scale & Stem
4. Whorled Rotala (Rotala wallichii) Aquatic Plant Care | Atlarium

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