Ammannia gracilis

Ammannia gracilis key facts

Growing Difficulty

Intermediate

Lifespan

Perennial; maintained by replanting cuttings

Size

20–50 cm tall, 12–20 cm wide

Temperature

22〜28℃

Watering

CO2 plus nitrate, phosphate and iron fertilisation

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.

About Ammannia gracilis

Ammannia gracilis is a stem plant that turns reddish-brown under strong light. This large 20-50cm perennial suits the mid- to background of aquascapes and can be maintained long-term through trimming and replanting.

7 things to know before growing Ammannia gracilis

1. 1Give It Strong Light

   Bright lighting is essential for bringing out Ammannia gracilis's signature cognac-red color. Under weak light it tends to stay green and grow leggy, so place it where light reaches well.

2. 2Plant Mid to Background

   This is a large plant, growing 20-50cm tall and 12-20cm wide, so it looks best planted in groups toward the middle or back of the tank rather than up front. Tanks of 76 liters or more give it room to show its full form.

3. 3Use Nutrient-Rich Substrate

   Because it grows so large, this plant has fairly high nutrient demands from its roots. A nutrient-rich substrate combined with root tabs helps keep leaf color and stem thickness consistent.

4. 4Trim and Replant Cuttings

   As a perennial, overgrown stems can be cut and replanted to keep the plant going indefinitely. Regular trimming both shapes the plant and rejuvenates it.

5. 5Choose Compact Nodes

   Look for a plant with tightly spaced leaf nodes and a sturdy stem, which establishes more easily. Leggy, stretched-out specimens can take longer to regain their proper form once settled in.

6. 6CO2 Boosts Coloration

   This is considered an intermediate-level plant, and growth and coloration tend to be more stable with CO2 injection. It can survive without CO2, but the reddish coloring is harder to achieve and the plant is more prone to legginess.

7. 7Keep Temperature Stable

   Sudden swings in water temperature can damage or drop leaves. Use a heater or chiller as needed through seasonal changes to keep conditions steady and avoid stressing the plant.

Frequently asked questions about Ammannia gracilis

Q.Is this plant suitable for beginners?

A.Ammannia gracilis is considered an intermediate-level plant. It needs a bit more attention to lighting and CO2 than easier species, so it's a good next step once you're comfortable with basic stem plants.

Q.Why does it stay green instead of turning red?

A.The main cause is insufficient light. Providing strong lighting for a sufficient duration each day helps bring out the cognac-red coloration.

Q.What tank size does it need?

A.Since it can grow 20-50cm tall and 12-20cm wide, it's best suited to the mid- to background of tanks 76 liters or larger. Smaller tanks can feel cramped for a plant this size.

Q.What should I do if it grows too tall?

A.Cut the top of the overgrown stem and replant it in the substrate as a cutting. Since it's a perennial, repeating this process lets you maintain it indefinitely.

Q.Is CO2 injection required?

A.It's not strictly required, but growth and coloration tend to be more stable with CO2. Without it, the plant is more prone to legginess and weaker red coloration.

Handy Growing Tools for Ammannia gracilis

Learn more about Ammannia gracilis in the encyclopedia

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