Rotala rotundifolia 'Hra'

Rotala rotundifolia 'H'ra' is a popular and visually striking aquatic stem plant, highly prized in aquascaping for its vibrant colors and graceful growth form. It is a cultivated variety derived from the very diverse Rotala rotundifolia species, originating from the H'Ra region in the central highlands of Vietnam (Gia Lai province) .

Here are its key characteristics and care requirements in detail.

 Key Features and Appearance

• Color: This is the plant's main selling point. Under optimal conditions, its narrow, needle-like leaves display a stunning range of colors from light orange and copper to intense reds and even red-violet tones . The underside of the leaves often has a reddish hue .

• Growth Habit: It has a distinctive overhanging or horizontal growth pattern, especially under high light, which creates a sense of movement and flow in the aquarium . It grows quickly and branches readily, allowing it to form dense, bushy clusters with regular trimming .

• Size: As a fast-growing stem plant, it can reach heights of 20-50 cm or more, making it suitable for the midground or background, depending on how it's pruned .

 Water Parameters and Conditions

This plant is adaptable but will show its best colors under specific conditions. The table below summarizes its preferred water parameters.

 Care and Maintenance for Optimal Color

• Lighting is Crucial: To achieve the vibrant orange and red tones, high lighting is essential . Under lower light, the leaves will remain a yellowish-green or pale orange .

• CO₂ and Nutrients: While it can survive without CO₂ injection, a CO₂ system is highly recommended to bring out its intense colors and compact growth . It also benefits greatly from a complete nutrient regimen, including iron supplementation, which directly influences the richness of its red coloration . A nutrient-rich substrate is also beneficial .

• Pruning for Bushiness: Regular trimming is key to maintaining a beautiful shape. Cut the tops of stems and replant them to encourage the growth of new side shoots, which leads to denser, more compact planting groups . Without trimming, the plant can become leggy .

 Aquascaping Uses

Its vibrant color and unique growth pattern make it a favorite for aquascapers.

• Color Contrast: It is often used to create a bold, warm-colored accent that contrasts beautifully with green plants .

• Dynamic Backgrounds/Midground: When planted in dense clusters, it creates a stunning backdrop . With very high light and regular pruning, it can even be trained to grow as a dense, orange cushion in the midground .

• Propagation: It is very easy to propagate through stem cuttings. Simply trim a healthy stem and replant the cutting into the substrate .