Propagating Rotala sp. 'Vietnam H'Ra'

A practical cuttings guide for the red Vietnamese stem plant Rotala 'Vietnam H'Ra', a cultivated form of the Rotala rotundifolia group, with conditions for strong colour.

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

1. Pick healthy stems with strong colour at the tips.
2. Cut the top 5-10 cm of each stem with clean scissors.
3. Strip the lowest leaves so a bare section of stem can be planted.
4. Push each cutting a few centimetres into nutrient-rich substrate, spacing them so light reaches each stem.
5. 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.