Ludwigia peruensis Care Guide
Ludwigia peruensis is a South American stem plant of the family Onagraceae, valued in aquaria for red foliage that intensifies under strong light.
Compiled by Aquairi from published sources · Published · Updated
Overview
Ludwigia peruensis is an aquatic stem plant belonging to the genus Ludwigia, a cosmopolitan group of roughly 82 species commonly called water-primroses or primrose-willows. In the aquarium trade the name is frequently applied to red-leaved Ludwigia of South American origin. Under sufficient lighting the foliage develops red to wine-red tones, while in low light the leaves turn green and may be shed.
Taxonomy
- Family: Onagraceae
- Genus: Ludwigia
- Scientific name: Ludwigia peruensis
- Common name: Peruvian Ludwigia
Habitat
The genus Ludwigia grows in wet habitats, with several species nearly or fully aquatic and adapted to growing in water through stem aerenchyma. Ludwigia peruensis is associated with South America; the related red Ludwigia commonly traded under this name originate from wetland and marshy environments.
Aquarium requirements
- Temperature: 22-28 °C (72-82 °F)
- pH: 6.0-7.5
- GH: 2-12 °dGH
- Lighting: medium to high (high light intensifies red colour)
- CO2: not strictly required, but beneficial
- Maximum height: up to about 50 cm
- Placement: background
Growth and care
This is a fast-growing stem plant that grows upright toward the water surface. A nutrient-rich substrate together with iron and micronutrient supply supports vigorous growth and coloration. Without adequate light the leaves green out, so strong illumination is the key factor for red expression.
Propagation
Ludwigia peruensis is propagated by cuttings. Cutting the shoot tip encourages the development of lateral shoots; trimmed tops can be replanted into the substrate to form new plants. Frequent trimming, roughly every 10 days, keeps the stand dense.
Propagating Ludwigia peruensis ('Peruensis' / 'Diamond')
Overview
Ludwigia peruensis belongs to the glandulosa/peruensis group of broad-leaved red ludwigias in the family Onagraceae; the closely associated Ludwigia glandulosa was historically sold as Ludwigia perennis. It is a vertical stem plant reaching roughly 15–40 cm, of medium growth and medium difficulty, whose foliage shifts toward red and orange under good light rather than turning green.
Propagation Method
Like other ludwigias it branches willingly and is propagated by cuttings and topping. When you cut the top off a stem, the cut top is replanted as a new plant while the remaining base sends out side shoots, so each topping multiplies the plant and thickens the group at the same time.
Step-by-Step
- Cut the stem at a node some distance below the final height you want the plant to reach, staggering cut heights for a natural slope.
- Take a 5–10 cm top cutting and strip the lower leaves so a clean node is exposed.
- Push the bare node into nutrient-rich substrate and let it root.
- Leave the topped base in place; new side shoots will appear at the cut.
- As shoots grow, remove any outlying ones that do not match the slope to keep tidy clusters.
Conditions for Healthy Growth
Coloration is light-driven: around 70–80 umols PAR is enough for good color, and higher light (80 umols+) also pushes more side shoots. At least 10 ppm CO2 improves color and branching, and roughly 30 ppm suits most demanding plants. Well-balanced fertilization with iron supports red pigment, supplied either at the roots or in the water column.
Trimming & Maintenance
Trim roughly every week to ten days. Repeated pruning at the node produces denser bushes as the base branches out, and each removed top becomes a new plant. Stagger cut heights to maintain a sloped, layered background.
Common Challenges
- Loss of red: too little light, CO2 or iron causes leaves to green out or yellow and drop.
- Leggy stems: insufficient light makes stems stretch with sparse foliage.
- Emersed-to-submersed transition: emersed-grown stock may melt initial leaves before settling into red submersed growth.