Rotala rotundifolia

A common aquarium plant, it is undemanding, but requires light to thrive. Rotala rotundifolia can withstand relatively cool temperatures. Losing its lower leaves usually means it is not receiving enough light. It can be grown emersed in shallow water, where it will flower. It is propagated by cuttings which form as side shoots.

The submerged form, having a leaf size of 2.5 cm or less, grows in a cluster of 2 or 3 around its pink stems, with a darker green color leaves or somewhat reddish in thin lanceolate shape. On the other hand, the new leaf form has a striking green color and prominent rounded leaves.

Under the right condition, flowering is visible in purple-pink color on the surface of the water, although the occurrence takes a matter of time. It multiplies vigorously in a short period. Cut the top half of a sturdy stem and replant it in the substrate (using a tweezer) after you remove any leaves from the last node of the stem. The trimmed mature stem will develop shoots that will produce a root system. This topping process will yield lush, bushy plants.  Over time, the older undergrowth deteriorates and becomes unhealthy. Simply allow the top to grow longer and replant the bush.

Rotala rotundifolia is a fragile plant, and you should not include it in an environment with big species of fish. These fish can easily damage the plant.

A Pink Rotala plant can display the most intense colors at a low nitrate level (5 mg/l) and a high phosphate plus prescribed iron/micronutrient levels. Various fertilizer doses bring color hues from pink to yellow. Remember to maintain nitrates below 5 ppm, and phosphates above 1 ppm will further enhance the appearance.  Under bright light, green leaves will turn fuchsia, pink or red. However, under medium light, the leaves become yellow-green and somewhat lanky. Under low light, the leaves will lose their bright color and become spindly.  The stronger the light you provide, the smaller and the more densely packed their leaves will be.

Place of origin: Asia
Maximum height: 15 – 30+ cm
Growth rate: Medium
Lighting: moderate to high, 1 to 2 watts per litre of water
CO2: Low
Demands: Easy to Moderate
Position range: Middle to back
Type: Planted
Substrate: Small granulated gravel or sand
Propagation: replant cuttings
Temperature range: 21 – 30°C
pH: 5.5-7.5
Hardness: DH of not over 15