Limnophila aromatica

Scientific name: Limnophila aromatica

Family: Scrophulariaceae

Maximum size reached under cultivation: 30 - 40 cm (11.81 - 15.75 inch)

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Recommended pH range: 6 - 7.5

Recommended water hardness: 3 - 14°dGH (53.57 - 250ppm)

0°C 32°F30°C 86°F

Recommended temperature range: 21 - 28 °C (69.8 - 82.4°F)

Preferred propagation method: Cuttings

Native to: East Asia

Growth rate: Fast

Recommended substrate: Fine gravel

Lighting requirements: Bright

Ideal placement in tank: Background

Family

Scrophulariaceae

Common Name

Rice Paddy Herb

Propagation

Limnophila aromatica reproduces easily through stem cuttings. Healthy tops or side shoots can be trimmed and replanted in the substrate. Before planting, remove the lower leaves to expose the stem, and insert it gently into fine gravel. The plant will develop roots quickly and continue growing under suitable conditions. Regular trimming promotes bushier, more compact growth and prevents the lower leaves from being shaded out.

Difficulty

Medium. While not difficult to propagate, it requires bright lighting and benefits from CO₂ supplementation to develop its signature red and purple hues. Poor light or unstable conditions may cause leaf drop or leggy growth.

Short Description

Originating from Southeast Asia, Limnophila aromatica is a highly attractive stem plant known for its striking coloration and fragrant leaves. It commonly grows in rice paddies, ditches, and wet fields, and is also used in Vietnamese cuisine for its distinctive lemon-cumin aroma. In aquariums, it can reach 30–40 cm (11.81 – 15.75 inches) and is best placed in the background where it adds vivid red, purple, and green tones depending on lighting and nutrients.

This plant transitions well from emersed to submerged form, though submerged growth tends to be more slender and vividly colored. Its lush, feathery appearance makes it ideal for Dutch-style and nature aquascapes. It can be grown emersed in paludariums or shallow tanks, where it may flower under the right conditions.

Maintenance and Care

Limnophila aromatica prefers bright lighting and nutrient-rich water. It thrives in a pH range of 6.0 to 7.5, with water hardness between 3–14°N (53.57 – 250 ppm) and temperatures of 21–28°C (69.8 – 82.4°F). CO₂ injection enhances coloration and density, though the plant can still grow in low-tech setups with strong light. Ensure that light reaches the lower portions of the plant to prevent leaf loss at the base. Fertilization with micronutrients and regular trimming are recommended for best results.

Compatibility

This species is compatible with most peaceful tropical fish, shrimp, and snails. Its tall, bushy growth provides shelter for small fish and adds vertical texture to planted tanks. Avoid keeping it with fish that uproot or nibble on plants. In community aquariums, it pairs well with contrasting green or pale-leafed species.

Submersion and Aquascaping

Limnophila aromatica is suitable for both submerged and emersed growth. In aquariums, it is typically grown fully submerged as a background plant, where it forms dense vertical clusters. In open-top tanks or emersed setups, it can produce small purple flowers and release its characteristic fragrance. It is especially popular in aquascapes that emphasize color variety and texture, and works well in contrast with green carpeting plants or midground stems.