Rotala H'Ra care guide
Rotala H'Ra (Rotala sp. 'H'Ra') — high light, 22-28 °C, pH 5.5-7, CO2 recommended.
Compiled by Aquairi from published sources · Published · Updated
Overview
Rotala H'Ra (Rotala sp. 'H'Ra') is an aquatic plant of the family Lythraceae, listed in the Aquairi knowledge base as an intermediate-level species. It is typically grown under high light with pressurised CO2 injection on nutrient-rich aquasoil. A spectacular orange-to-red stem plant from Vietnam that develops stunning warm coloration under high light. Less demanding than Rotala macrandra while offering equally vivid colors, making it popular in Dutch-style aquascapes.
Taxonomy
- Family: Lythraceae
- Genus: Rotala
- Scientific name: Rotala sp. 'H'Ra'
- Common synonyms: Rotala sp. H'Ra, Rotala Vietnam H'Ra
Habitat
Rotala is a genus of small marsh plants (Lythraceae) distributed across the Old-World tropics, from India and South-East Asia to tropical Africa and northern Australia. Many forms occur in rice paddies, ditches and seasonally flooded lowlands. In the Aquairi knowledge base, populations associated with this form are recorded from Vietnam.
Growth requirements
- Lighting: high
- CO2: recommended
- Temperature: 22-28 °C (72-82 °F)
- pH: 5.5-7
- GH: 2-8 °dGH
- Substrate: nutrient-rich aquasoil
- Maximum height: 30 cm
- Growth rate: medium
- Recommended placement: background
Placement
A background or midground stem. Bright light combined with CO2 injection brings out the orange, pink and red tones for which Rotala is grown; lean nitrogen and abundant micros sharpen the colour further. In the Aquairi knowledge base this form is recommended for the background under high light with pressurised CO2 injection, using nutrient-rich aquasoil.
Propagation
Pinched off and replanted cuttings root in days; periodic topping creates the dense bushy cluster characteristic of Dutch- and nature-style layouts. Documented propagation techniques for this entry include: stem cuttings.
Common issues
Small upright leaves and pale tips indicate insufficient light or CO2; reducing nitrate slightly while raising iron tends to intensify the red pigments.
How to Propagate Rotala H'Ra from Cuttings
Overview
Rotala H'Ra is a cultivated form of Rotala rotundifolia, a plant of the family Lythraceae that grows as a common weed in rice paddies and wet places across India, China, Taiwan, Thailand, Laos and Vietnam. The parent species shows a clear difference between growth forms: the emersed form has rounded leaves, while submerged leaves are narrow and lanceolate. Under strong light the foliage can turn almost wine red, and in this selected form that response leans toward vivid orange-red.
Rotala rotundifolia is propagated by cuttings, and H'Ra is multiplied in exactly the same way. Since it is a vegetative colour form, every cutting carries the same colouring potential as the parent stem when given matching light and nutrient conditions.
Propagation Method (Cuttings)
Topping is the core technique. Cut the upper 5 to 10 cm from a healthy stem and replant that top as a new plant. The remaining base sends out side shoots from the nodes below the cut, so a single planted stem branches into several over successive trims, building the density a background group needs.
Step-by-Step
- Select a vigorous, well-coloured stem and cut the top 5 to 10 cm with clean scissors.
- Strip the narrow lower leaves from the bottom 2 to 3 cm so the nodes are bare and ready to root.
- Push the bare base into nutrient-rich substrate, planting stems close together to encourage upright growth.
- Leave the rooted lower portion in place so it branches into side shoots from the nodes below the cut.
- Keep strong light over the replanted tops so the new growth colours up as it establishes.
Conditions for Healthy Growth
The parent species is undemanding but requires light to thrive, and light deficiency causes the loss of lower leaves. For the warm orange-red of H'Ra, pair strong lighting with lean nitrate; richer nitrogen pushes the plant greener. It can also be grown emersed in shallow water, where the rounded emersed leaves replace the narrow submersed form, a useful way to bulk up stock before flooding a tank.
Trimming & Maintenance
Trim often, roughly every week to ten days, to keep the hedge dense and the colour concentrated at the top. Each trim doubles as propagation, since the removed tops are the new cuttings. Cutting at slightly different heights across the group staggers regrowth and avoids a flat, hard line, giving the background a fuller, more natural shape.
Common Challenges
Bare lower stems are the usual complaint and trace back to too little light reaching the base, just as in the parent species. Disappointing colour almost always means the light is too weak or the nitrate too high. Newly planted cuttings may shed some leaves while adapting from emersed to submersed growth, but they recover as the lanceolate underwater foliage takes over.