Ludwigia Arcuata (Ludwigia arcuata) Care Guide
A delicate stem plant with narrow needle-shaped leaves that turn from green to vivid orange-red under strong lighting.
Compiled by Aquairi from published sources · Published · Updated
Overview
Ludwigia arcuata is an aquatic plant in the family Onagraceae. A delicate stem plant with narrow needle-shaped leaves that turn from green to vivid orange-red under strong lighting. Its fine texture creates an appealing contrast when planted alongside broader-leaved species in the midground or background.
Taxonomy
- Family: Onagraceae
- Genus: Ludwigia
- Scientific name: Ludwigia arcuata
- Other names: Needleleaf Ludwigia
Habitat
Native to the southeastern United States, where it occurs along the banks of slow waters and seasonally flooded sites. Submerged growth produces narrow lanceolate leaves that intensify to orange-red under high light.
Growth requirements
- Light: high (≥80 PAR at substrate)
- CO2: pressurised CO2 recommended
- Temperature: 20-28 °C
- pH: 5.5-7
- GH: 2-10 °dGH
- Substrate: nutrient-rich aquasoil or fertilised gravel
- Nutrient demand: medium
- Growth rate: medium
- Difficulty: intermediate
Placement
- Recommended placement: midground
- Maximum height: 30 cm
- Trim every: 10 days
Propagation
In cultivation the plant is propagated by stem cuttings (replant the upper portion after trimming).
How to Propagate Ludwigia Arcuata from Cuttings
Overview
Needle-leaf ludwigia, properly Ludwigia arcuata, is a delicate stem aquatic plant that originates from the Americas. Its fine narrow leaves give it a feathery texture that contrasts well with broader-leaved neighbours. It is tolerant of a wide range of water parameters and generally easy to grow as long as it receives sufficient light and nutrients, which also makes its cuttings forgiving while they establish.
The plant is propagated vegetatively from cuttings rather than seed. Because it can be pruned aggressively and readily forms side shoots, a single stem can be turned into a dense bushy stand over a few trimming cycles.
Propagation Method (Cuttings)
The method is topping. Cut off the top of the plant a few inches below the desired final height and replant that top. Side shoots then sprout from the remaining lower part to fill in the area, so the base becomes bushier rather than being discarded. Pruning aggressively encourages this branching and makes the plant very bushy.
Step-by-Step
- Cut off the top of a healthy stem a few inches below the desired final height using clean scissors.
- Strip the fine leaves from the lowest section of the cutting to expose bare nodes for rooting.
- Plant the cuttings with stems about 1.5 cm apart to encourage them to grow more vertically.
- Leave the remaining lower part in place so side shoots sprout and fill in the area.
- Provide bright light immediately so the new growth roots, branches and colours up.
Conditions for Healthy Growth
Ludwigia arcuata requires bright lighting in order to grow well, and stronger lighting induces better colouration and more branching. The red flush deepens under nitrate limitation; the plant becomes much redder under low NO3. With plenty of light and space it tends to grow sideways, so spacing and light placement matter as much as feeding for a tidy, colourful result.
Trimming & Maintenance
Trim regularly and do not be timid: the plant can be pruned aggressively, and each cut both shapes the clump and yields fresh cuttings. Repeated topping keeps the stems branching and bushy. Planting and trimming so stems stay close together counteracts the plant's tendency to sprawl sideways, keeping growth more vertical.
Common Challenges
Weak colour and thin, leggy growth almost always mean too little light; this is a plant that genuinely needs bright lighting. If it grows sideways and sparse, give it more light and plant the stems closer together. Lean nitrate intensifies the red, so overly rich water can leave the plant stubbornly green even under strong light.