Rotala Wallichii (Rotala wallichii) Care Guide
A delicate stem plant with extremely fine needle-like leaves arranged in dense whorls that turn vivid pink to red under high light.
Compiled by Aquairi from published sources · Published · Updated
Overview
Rotala wallichii is an aquatic plant in the family Lythraceae. A delicate stem plant with extremely fine needle-like leaves arranged in dense whorls that turn vivid pink to red under high light. One of the most beautiful aquarium plants when thriving, but demands pristine water quality and stable CO2 levels.
Taxonomy
- Family: Lythraceae
- Genus: Rotala
- Scientific name: Rotala wallichii
- Other names: Whorly Rotala
Habitat
A stem plant in the family Lythraceae from tropical Asia. Inhabits sluggish wetlands; the submerged form develops needle-like leaves arranged in whorls and intensifies to pink-red tones under bright light.
Growth requirements
- Light: high (≥80 PAR at substrate)
- CO2: pressurised CO2 recommended
- Temperature: 22-28 °C
- pH: 5.5-7
- GH: 1-6 °dGH
- Substrate: nutrient-rich aquasoil or fertilised gravel
- Nutrient demand: high
- Growth rate: medium
- Difficulty: advanced
Placement
- Recommended placement: background
- Maximum height: 30 cm
- Trim every: 10 days
Propagation
In cultivation the plant is propagated by stem cuttings (replant the upper portion after trimming).
Rotala wallichii Propagation Guide: Cuttings for Whorly Rotala
Overview
Rotala wallichii, the whorly rotala, is a demanding background stem plant with extremely fine needle-like leaves set in dense whorls. With strong light its tips flush vivid pink to red. It is propagated only by cuttings, where each healthy section can regrow into a new plant.
Propagation Method (Cuttings)
Propagation is done by topping. You can cut almost anywhere along a healthy stem as long as the remaining piece stays robust and the removed top is not too short. Both the replanted top and the trimmed base will continue to grow, the base sending out new lateral shoots.
Step-by-Step
- Choose a healthy, well-coloured stem with firm growth.
- Cut off the top 5 to 10 cm with clean scissors.
- Strip the lowest whorls of fine leaves from the cutting.
- Push the bared stem base gently into nutrient-rich substrate.
- Leave the parent base in place so it branches into new side shoots.
Conditions for Healthy Growth
This species needs lots of light, clean clear water, and plenty of nutrients plus CO2. Light is the most deciding factor: without enough, it is unforgiving and will not colour up. Soft water is preferred, and because the fine leaves clog easily there should be no particles drifting in the water column. Strong light and CO2 together drive the pink to red colour.
Trimming & Maintenance
Top the plant about every ten days, replanting the cut tops to keep a dense, even stand. Regular topping forces the base to throw more lateral stems, thickening the bush over time. Keep water and filtration clean so the delicate whorls stay clear of debris.
Common Challenges
Insufficient light or unstable CO2 is the usual cause of stalled, green, or thinning growth. Floating particles cling to the needle leaves and dull them. New cuttings may pause before rooting; healthy plants then resume rapid new growth once established.