Description
Plant Profile
Lobelia Cardinalis Red, commonly known as the Red Cardinal Plant, is an aquatic stem species native to marshlands, riverbanks, and waterways across North America. In submerged aquarium conditions, it produces sturdy vertical stems lined with rounded, light-to-medium green leaves. As the plant grows taller toward the water surface or under higher light levels, the undersides and margins of the foliage develop purple and deep red coloration. Reaching a height of up to 12 inches, its columnar growth makes it a popular choice for structured midground rows, Dutch-style streets, and background placements. Growing well in basic setups without required CO2, it serves as a beginner-friendly and low-tech plant option for aquascapers adding structure to a planted tank.
Key Features & Benefits
Columnar stem provides structured vertical lines and Dutch-style plant street layouts.
Submerged foliage transitions from bright green to purple and red undertones under moderate to high light.
Hardy North American marsh species that adapts well to a range of low-tech and high-tech aquarium setups.
Care & Planting Instructions
Gently remove the plant from its lead bunch wrap or potted container, carefully inspecting the lower stem bases under room-temperature water.
Use fine-tip pinsettes to insert individual stems 1 inch apart into your aquarium soil to allow light to reach lower leaves.
Provide medium to high lighting; while CO2 injection is not required, supplying pressurized CO2 and regular liquid iron supplementation helps intensify the red and purple leaf hues. See our guide to growing red aquarium plants.
Maintain stable water parameters to avoid leaf melting or stem deterioration during the transition period.
To propagate, trim main stem tops or side shoots with sharp straight shears and replant the cuttings directly into your aquarium soil. Read our trimming & propagation guide for details.
Quick Facts
Listed information should be treated as general guidelines only. Team Buce Plant encourages you to do thorough research to ensure healthy growth!
Attribute
Specification
Scientific Name
Lobelia cardinalis
Common Name(s)
Red Cardinal Plant, Lobelia Cardinalis Red, Cardinal Flower
Family
Lobeliaceae / Campanulaceae
Plant Type / Taxonomy
Aquatic Stem / Marsh Plant
Care Difficulty
Easy
Light Requirement
Medium to High
CO2 Requirement
Optional / Recommended (Enhances growth density and red undertones)
Placement / Usage
Midground / Background Rows & Dutch Streets
Height / Size
Up to 12” (Shipping size: 2–3”)
Growth Rate
Moderate
Water Parameters
pH 6.0–7.5
Propagation Method
Cuttings (Cut stem tops or side shoots and replant)
Origin
North America
Frequently Asked Questions
1. How do I prep bunched Lobelia Cardinalis Red before planting?
Remove the lead weight, rubber band, or foam wrapping surrounding the lower stems under room-temperature water. Inspect the base of each stem, trim off any damaged lower tissue, and insert individual stems into your aquarium soil using pinsettes.
2. How do I bring out the red and purple colors on Lobelia Cardinalis Red?
While submerged leaves remain green under basic lighting, providing moderate to high light intensity, pressurized CO2, and regular iron supplementation will encourage deep red and purple undertones on the foliage.
3. How is Lobelia Cardinalis Red used in Dutch-style aquascapes?
Because Lobelia Cardinalis Red grows in structured, upright columns, aquascapers frequently plant stems at stepped heights in a diagonal row, creating a clean “Dutch plant street” that provides depth across the aquarium floor.
