Rotala Vietnam H'Ra care guide
Rotala Vietnam H'Ra (Rotala sp. 'Vietnam H'Ra') — high light, 22-28 °C, pH 5.5-7, CO2 recommended.
Compiled by Aquairi from published sources · Published · Updated
Overview
Rotala Vietnam H'Ra (Rotala sp. 'Vietnam 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 popular Vietnamese Rotala variety with narrow leaves that turn intense pink to magenta under high light with CO2. Grows faster and is more forgiving than many red Rotalas, making it an excellent entry point into demanding colored stem plants.
Taxonomy
- Family: Lythraceae
- Genus: Rotala
- Scientific name: Rotala sp. 'Vietnam H'Ra'
- Common synonyms: Rotala sp. Vietnam
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.
Propagating Rotala sp. 'Vietnam H'Ra'
Overview
Rotala 'Vietnam H'Ra' is a cultivated form belonging to the Rotala rotundifolia group. The parent species, Rotala rotundifolia, is native to India, China, Taiwan, Thailand, Laos and Vietnam and is commonly sold in the aquarium trade. Its emersed form has rounded leaves while submerged leaves are narrow and lanceolate, and under intense illumination the foliage takes on wine-red tones. The cultivar is grown for that narrow-leaved, pink-to-red column in the background.
Propagation Method (Cuttings)
Rotala rotundifolia, and therefore this cultivated form, is propagated through cuttings. Topping the stems and replanting the cut tops is the standard approach; the trimmed bases then branch and send up new side shoots, so a single planting steadily multiplies into a dense group.
Step-by-Step
- Pick healthy stems with strong colour at the tips.
- Cut the top 5-10 cm of each stem with clean scissors.
- Strip the lowest leaves so a bare section of stem can be planted.
- Push each cutting a few centimetres into nutrient-rich substrate, spacing them so light reaches each stem.
- Keep the trimmed bases in place; they branch out and produce fresh shoots from below the cut.
Conditions for Healthy Growth
The parent species requires adequate lighting to flourish; insufficient light causes loss of the lower leaves. It tolerates relatively cool temperatures and is described as undemanding apart from that light dependency. For this red cultivar, intense illumination is what brings out the wine-red colouration that the rotundifolia group shows under strong light, and CO2 supports the dense, compact growth that makes it attractive.
Trimming & Maintenance
Regular topping keeps the stand bushy: cut the tops, replant them, and let the bases rebranch. This is also the routine that supplies all your propagation material, so trimming and multiplying are the same task for this plant.
Common Challenges
Loss of basal leaves and leggy stems are the classic signs of too little light. Because the emersed form carries rounded leaves and the submerged form narrow lanceolate ones, newly submerged cuttings may transition through a change in leaf shape before settling into their underwater form. Keep light strong and conditions stable to hold colour and density.