Rotala rotundifolia: living card for a stem plant

Rotala rotundifolia earns its place in aquascaping through fine bushes, fast response, and colour under the right conditions. Light, nutrients, and trimming decide whether it becomes structure or clutter.

Quick read

• Type: medium-fast stem plant.
• Aquarium: medium or high-tech planted tank, also bright low-tech.
• Indicative temperature: 20-28 C.
• pH: 5.5-7.5.
• Light: medium to high.
• CO2: optional, recommended for dense bushes.
• Planting: grouped stems, trim and replant tops.
• Difficulty: medium; easy to grow, harder to keep compact.

What to check before planting

Look for compact tips, uncrushed stems, and no hair algae. Emersed-grown plants may change leaf form underwater.

During adaptation, old leaves may die back while new shoots appear in a different form. Judge the growth point, not a perfect old leaf.

Planted-tank design

It works as a rear or side bush. Trim in layers so the base receives light instead of becoming a green cloud above bare stems.

The right position prevents future work: slow plants under less light, stem plants with trimming margin, and large plants where they do not block the whole aquarium.

Working parameters

With CO2 and steady dosing it grows denser. Without CO2, reduce expectations of intense colour and avoid excessive light that drives algae.

The plant responds to light, carbon, nutrients, flow, and stability, not to labels like low-tech or high-tech. Change one variable at a time so you can see what worked.

Compatibility and warning

Good with small fish and shrimp. Large fish or strong currents can dismantle freshly trimmed bushes.

Black lower stems, tiny leaves, or twisted tips call for checks on real light, CO2, nitrogen, and micronutrients.

Reference sources

Tropica Aquarium Plants and Kew Plants of the World Online for culture, growth type, and botanical reference. Ranges are indicative and depend on light, nutrients, CO2, and the plant’s original growth form.