Scientific Name: Lobelia cardinalis
Common Name: Cardinal Plant, Cardinal Flower
Origin: North America
Growth Rate: Moderate
Difficulty Level: Easy to Moderate
Temperature: 20–28°C
pH: 6.0–7.5
GH: 2–12 dGH
KH: 1–8 dKH
Moderate to high lighting is recommended.
Moderate light promotes healthy green growth and compact leaf formation.
Under high light, submerged leaves may develop bronze to reddish-purple tones, especially near the top of the plant.
CO₂ supplementation is beneficial but not essential.
Encourages faster growth, denser foliage, and improved coloration.
The plant adapts well to both low-tech and high-tech aquariums.
Requires regular supplementation of macro and micronutrients.
Benefits from nutrient-rich substrates due to its strong root system.
Adequate nitrate, phosphate, potassium, and trace elements support healthy growth.
Root tabs can significantly enhance growth and leaf size.
Best suited for the midground to background.
Can also be used in the foreground of large aquariums when regularly trimmed.
Often planted in groups to create a lush, natural appearance.
Easily propagated through stem cuttings.
Cut healthy stem tops and replant them into the substrate.
Trimmed stems readily develop side shoots and new roots.
Regular trimming encourages bushier growth and prevents excessive height.
Plant stems in groups for a fuller and more attractive appearance.
Stable nutrient levels help maintain healthy foliage and coloration.
Emergent growth above the water surface may produce attractive red flowers.
Lobelia cardinalis is a versatile and attractive stem plant known for its rounded leaves, sturdy growth habit, and ability to develop subtle bronze to reddish hues under strong lighting. Its structured appearance makes it an excellent choice for creating contrast and depth in planted aquariums. With balanced fertilization, stable water conditions, and optional CO₂ supplementation, it forms dense, vibrant groups that enhance the beauty of Nature, Dutch, and low-tech aquascapes.
