Source: Wikimedia Commons
Lobelia Cardinalis
IntermediateLobelia cardinalis
A stem plant with bright green underwater and red flowers above. Interesting difference between submersed and emersed forms.
About
Lobelia cardinalis is a perennial plant in the family Campanulaceae, native to North America, cultivated as a dimorphic aquatic plant in both submerged and emersed forms. The submerged leaves are beautiful bright light-green to yellow-green ovals, while the emersed form produces tall stems bearing deep crimson flowers. Some varieties develop purple-tinged undersides underwater, adding depth and contrast to aquascape layouts. Most commonly placed in mid to background positions, it forms dense bushy growth with regular trimming and height adjustment. Relatively easy to grow with CO2 addition and medium to strong lighting. Nutrient demands are moderately high, and periodic application of iron-containing liquid fertilizer enhances leaf color. Optimal water temperature is 18–26°C, and caution is needed in high-temperature conditions.
Basic Info
Origin
North America (eastern and central regions)
Lifespan
Perennial
Size
10-30cm
Temperature
18〜26℃
Watering & Fertilizer
Root tabs, CO2
Growing Tips
Lighting
Grows in medium to strong lighting
CO2
CO2 addition promotes growth
Growth
Produces red flowers in emersed culture
Notes
Leaves become compact and round underwater
Lobelia Cardinalis FAQ
QWhat is the growing difficulty level for Lobelia Cardinalis?
Intermediate. A variety suitable for intermediate growers. Requires some cultivation experience and knowledge of environment management. Pay careful attention to temperature and humidity control.
QWhat is the ideal temperature for Lobelia Cardinalis?
The ideal temperature for Lobelia Cardinalis is 18〜26℃. Avoid sudden temperature changes and maintain a stable environment.
QWhat is the lifespan of Lobelia Cardinalis?
The average lifespan of Lobelia Cardinalis is Perennial. With proper cultivation environment and nutrient management, you can keep it healthy for a long time.
QHow large does Lobelia Cardinalis get?
The mature size of Lobelia Cardinalis is 10-30cm. This may vary slightly depending on cultivation environment and individual differences.
QHow should I water and fertilize Lobelia Cardinalis?
Lobelia Cardinalis: watering & fertilizer — Root tabs, CO2. Aim for appropriate frequency and amount.
QWhat is the typical price for Lobelia Cardinalis?
The price of Lobelia Cardinalis varies significantly by variety, characteristics, size, and lineage. Please check ボタちょく's price guide for the latest market information.
Last updated: June 24, 2026
References & Sources
Edited & verified by: BoTachoku Editorial Team
The classifications, regulations, and growing data on this page are created and verified based on the primary information database below.
Taxonomy & Authority
Regulations & Conservation Status
Sources: 環境省 特定外来生物等一覧(外来生物法) / CITES Appendix II 植物掲載分類群(科・属レベル)
Regulations may change. Always verify the latest information with the relevant authorities.
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