Curly Waterweed
Lagarosiphon major
Major
About this plant
Lagarosiphon major, commonly called Curly Waterweed, is a submerged aquatic plant with long, curly leaves. It grows underwater and can form dense mats. It is often found in lakes and slow-moving rivers. While it can provide habitat for aquatic animals, it is considered invasive in some areas because it spreads quickly and can choke waterways.
Taxonomy
- Genus
- Lagarosiphon
- Family
- Hydrocharitaceae
- Higher classification
- Order Alismatales
- Plant type
- Perennial
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Southern Africa
- Distribution
- Native to southern Africa; invasive in parts of New Zealand, Europe, and North America where it has been introduced.
Care
- Light preference
- Partial sun
- Suitable locations
- Outdoor, Greenhouse, Indoor
- Preferred window facing
- East-facing, South-facing
- Watering frequency
- Frequent
- Humidity
- High
- Minimum
- 10 °C
- Maximum
- 30 °C
- Optimal
- 18-25 °C
- USDA hardiness zones
- 8-11
- Soil pH
- neutral to slightly acidic
- Soil type
- aquatic substrate or nutrient-rich sediment
Watering. As an aquatic plant, it grows submerged in water and requires constant water coverage. Ensure water is clean and well-oxygenated.
Fertilizing. In natural or aquarium settings, additional fertilizing is usually not needed if the water has sufficient nutrients. In controlled environments, occasional aquatic plant fertilizers can be used.
Lagarosiphon major is an aquatic plant that grows submerged in water. It requires a stable aquatic environment with clean water and moderate light. It can be sensitive to poor water quality and may need occasional trimming to prevent overgrowth.
Propagation
- Propagation methods
- Cuttings
- Care difficulty
- Medium
Ornamental features
- Flowering
- Yes
- Flowering period
- summer
Curly, bright green submerged leaves that form dense underwater mats; small white flowers may appear above water.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Invasive
Not known to be toxic to humans or pets.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Skin contact
- Pollen level
- None
Lagarosiphon major is not known to cause allergies in most people. However, if you handle it frequently, some individuals might experience mild skin irritation. Wearing gloves can help reduce any risk.
Common problems
If water quality is poor or light is insufficient, the plant may become weak or die back. Overgrowth can clog waterways and reduce oxygen levels in water, harming fish and other aquatic life.
Uses
Primarily used as an ornamental aquatic plant in ponds and aquariums; also provides habitat for aquatic life but can be invasive in natural waterways.
Notes
Regular trimming helps control growth and prevents the plant from taking over aquatic environments. It is important to avoid releasing this plant into natural waterways where it is not native, as it can become invasive.