Lobelia Cardinalis

Lobelia cardinalis is a versatile and visually striking aquarium plant known for its rounded leaves and upright growth pattern. In submerged conditions, it displays vibrant green foliage, while emersed growth can produce beautiful purple tones—making it a unique and dynamic addition to planted aquariums.

Native to North America, this plant typically grows along riverbanks and wetlands. In aquariums, it develops sturdy stems with evenly spaced leaves, creating a structured, layered look that works well in both midground and background placements.

Lobelia cardinalis thrives in moderate lighting and benefits from nutrient-rich substrates and CO₂ supplementation, though it can adapt to lower-tech setups. With proper trimming, it can be shaped into compact bushes or allowed to grow taller for added height and contrast.

Key Features

• Rounded, bright green leaves (submerged form)
• Upright, structured growth
• Can develop red coloration when grown emersed
• Adds contrast and layering to aquascapes
• Versatile placement and shaping options
• Suitable for a wide range of tank setups

Care & Growing Conditions

• Lighting: Moderate
• Temperature: 68–82°F
• pH: 6.0–7.5
• Water Flow: Low to moderate
• CO₂: Recommended (but not required)
• Substrate: Nutrient-rich preferred
• Propagation: Stem cuttings

Tip: Trim and replant cuttings to create a fuller, bushier appearance and maintain desired height.

Ideal Uses

• Midground to background plant
• Nature-style aquascapes
• Adding structure and contrast
• Creating bushy groupings
• Transition plant between foreground and background

Plant Details

• Scientific Name: Lobelia cardinalis
• Common Name: Cardinal Plant
• Plant Type: Stem plant
• Origin: North America
• Growth Rate: Moderate
• Placement: Midground to background
• Difficulty: Easy to medium
• Max Height: 8"