Marsh seedbox
Ludwigia palustris · Onagraceae
The gardener's calendar
Ideal time to plant marsh seedbox: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Onagraceae
- Form
- Herbaceous
- Foliage
- Deciduous to semi-evergreen
- Flowering
- Spring to autumn
- Adult size
- 15 to 40 cm in height
- Growth
- Fast
- Hardiness
- Moderate (0 to 5°C depending on variety)
- Origin
- North and South America
Care
Watering
Ludwigia appreciates humid environments and can tolerate constantly wet soils or even partial aquatic settings. Keep your substrate moist at all times, especially during active growth. In terrestrial form, regular and moderate watering is necessary; in aquatic environments, the water naturally meets its needs.
Light exposure
Choose a bright location, ideally in full sun or partial shade, to promote vigorous growth and generous flowering. This plant tolerates intense light well, so it can also handle partial shade while remaining productive.
Soil and substrate
Ludwigia adapts to many soil types: prefer a substrate rich in organic matter, slightly acidic to neutral, well-draining in terrestrial form or specialized for aquatic use in aquatic form. Adding compost will boost vigor and flowering.
Fertilizer
A balanced fertilizer application in spring and early summer supports growth and flowering. In aquatic environments, a specific aquatic plant fertilizer is recommended; in terrestrial settings, diluted organic fertilizer monthly is generally sufficient.
Pruning and maintenance
Pruning is not essential, but pinching the tips of young shoots encourages branching and a more compact form. Remove dead or damaged stems to improve air circulation and promote better growth.
Diseases and pests
Ludwigia is generally robust and rarely susceptible to diseases if humidity and light conditions are respected. Occasionally monitor for aphids or mealybugs; if they appear, a mild treatment with black soap is usually sufficient.
Did you know?
Ludwigia is a remarkable plant found in wetlands and marshes of North America: it can live entirely submerged or emerged, adapting its form and leaves to suit the conditions. In aquarium keeping, it's valued for its ability to convert carbon dioxide into oxygen while remaining easy to cultivate, making it an excellent choice for beginners in aquatic plants.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.