Source: Wikimedia Commons
Ammannia gracilis
IntermediateAmmannia gracilis
A large stem plant with long, narrow opposite leaves that turn a cognac-red in strong light. Reaching 20–50 cm tall and 12–20 cm wide, it makes a bold statement in the mid- or background of tanks of 76 litres or more.
About
Ammannia gracilis (Lythraceae) is a stem plant from swamps in West Africa around Senegal and Gambia. It spread in the hobby from plants an aquarist brought back from Liberia, and in Europe it is called the 'large cognac plant', the most popular member of its genus. Size and colour distinguish it: long, narrow, blunt-tipped leaves in opposite pairs on stems 20–50 cm tall and 12–20 cm wide. Strong light turns it red-brown to cognac; iron deficiency makes the leaves fade, while excess iron or nitrate produces longer stems and greener, less red colour. The deepest colour comes from low nitrate with generous phosphate and trace elements. Its demands are moderate, but to show its best it needs strong light and CO2 (around 25–30 mg/L). It prefers soft, slightly acidic water but adapts to a range of conditions, and in good conditions it quickly reaches the surface. It is fairly commonly sold by specialist shops in Japan.
Size of the Ammannia gracilis
The Ammannia gracilis grows to 20–50 cm tall, 12–20 cm wide.
Temperature & humidity for the Ammannia gracilis
The ideal temperature for the Ammannia gracilis is 22〜28℃.
Basic Info
Origin
West Africa (Senegal and Gambia region)
Lifespan
Perennial; maintained by replanting cuttings
Size
20–50 cm tall, 12–20 cm wide
Temperature
22〜28℃
Watering & Fertilizer
CO2 plus nitrate, phosphate and iron fertilisation
Growing Tips
Lighting
Needs medium to strong light; stronger light deepens the red-brown.
CO2 & Fertilizer
CO2 at around 25–30 mg/L is advisable. Low nitrate with ample phosphate and trace elements gives the best colour; iron deficiency fades the leaves.
Water Temperature & Quality
Optimum 22–28°C in soft, slightly acidic water (pH 5–7.5), though it adapts somewhat.
Substrate & Attachment
It grows large; plant it in the mid- or background of tanks of 76 litres or more.
Trimming & Propagation
When stems reach the surface, replant the tops; side shoots can also be replanted.
Cautions
Too large for small tanks. Never release plants into the wild.
Ammannia gracilis FAQ
QWhat is the growing difficulty level for Ammannia gracilis?
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 Ammannia gracilis?
The ideal temperature for Ammannia gracilis is 22〜28℃. Avoid sudden temperature changes and maintain a stable environment.
QHow large does Ammannia gracilis get?
The mature size of Ammannia gracilis is 20–50 cm tall, 12–20 cm wide. This may vary slightly depending on cultivation environment and individual differences.
QHow should I water and fertilize Ammannia gracilis?
Ammannia gracilis: watering & fertilizer — CO2 plus nitrate, phosphate and iron fertilisation. Aim for appropriate frequency and amount.
QWhat is the typical price for Ammannia gracilis?
The price of Ammannia gracilis varies significantly by variety, characteristics, size, and lineage. Please check GrowerDirect's price guide for the latest market information.
Last updated: September 23, 2026
References & Sources
Edited & verified by: GrowerDirect 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
Not listed in CITES (no match in Species+). Not regulated under Japan's Invasive Alien Species Act or Species Conservation Act. Never dump aquatic plants into rivers, ponds or ditches, or flush them away with tank water. Drain unwanted plants and trimmings and dispose of them as household waste.
Sources: Species+ (CITES listing check) / Ministry of the Environment: list of Invasive Alien Species (Invasive Alien Species Act)
Regulations may change. Always verify the latest information with the relevant authorities.
Related Species
Find listings for this species
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