Species description

Care, breeding and tankmates

Plant profile

Placement

Background

This versatile plant is a staple for the background of planted aquariums, where it forms dense, bushy thickets. It naturally curves and arches gracefully toward the light, softening harsh hardscape lines. Its ability to create massive, colorful background walls makes it a favorite in both Dutch and Nature style layouts.

Botanical form

Stem

Despite its name, which means 'round-leaved', the submerged leaves are actually narrow and elongated. Under moderate light, the foliage remains a vibrant green, but high light and CO2 transform the upper leaves into brilliant shades of pink and red. The stems are flexible and tend to arch horizontally before reaching the surface.

Growth

Fast

It is an incredibly fast-growing stem plant that will quickly reach the water's surface under most conditions. This rapid growth makes it excellent for competing with algae in newly established tanks, as it absorbs excess nutrients efficiently. Regular and sometimes aggressive trimming is required to keep it from taking over the aquarium.

Substrate

Medium

Rotala rotundifolia is highly versatile and readily roots in nearly any standard aquarium substrate, from nutrient-packed aqua soils to plain sand or fine gravel. The root network acts swiftly to anchor its fast-growing stems and is very efficient at absorbing both substrate and water column nutrients. A standard depth of 3 to 5 centimeters is recommended to give the root system enough space to support its often dense, bushy growth.

Column fertilization

Required

It absorbs the vast majority of its nutrients directly from the water column through its leaves. A simple, regular liquid fertilizer dosing routine is usually sufficient to keep it thriving and growing rapidly. While it can grow without injected CO2, adding it will significantly increase the stem thickness and color intensity.

Root fertilization

None

While it is primarily a water column feeder, planting it in a nutrient-rich substrate provides a good foundation for a strong root system. It frequently sends out white aerial roots from its nodes, which help it anchor and absorb additional nutrients from the water. Substrate fertilization is less critical for this species than for more demanding Rotala varieties.

Trimming

Occasional

Rotala rotundifolia thrives on frequent, heavy trimming, which encourages it to branch out and form incredibly dense bushes. It can be cut very low, and multiple new shoots will rapidly emerge from the remaining stumps. Trimming it into a rounded, sloping shape is a classic technique used to create depth in aquascaping.

Propagation

Cuttings, Runners

Propagation is incredibly easy and is done by taking stem cuttings and planting them in the substrate. Almost any cut portion of the stem will root and begin growing new shoots within days. Leaving the rooted bottoms in the substrate after a trim is the standard way to multiply its density.

Sensitivity

Moderate

This is one of the hardiest and most forgiving stem plants available in the hobby. It tolerates a wide range of water parameters, from soft to hard water, and can adapt to lower light levels. However, if shaded completely, the lower portions of the stems will drop their leaves and become bare.

Layout role

Background, Midground

It is arguably the most popular background stem plant used to add volume, texture, and color to aquascapes. Its graceful, arching growth habit makes it perfect for creating flowing bushes that sway gently in the current. It transitions beautifully from green at the bottom to red at the top, adding a natural gradient to the layout.