Lagenandra thwaitesii Engl.

• Genus: Lagenandra
• Botanical Background: Named by the German botanist Georg August Engelmann, this species was first described in the 19th century, contributing to the understanding of Aroids in tropical ecosystems.

• Geographical Range: Endemic to Sri Lanka, specifically thriving in the marshes and waterways of the wet zone of the island.
• Environment: Naturally grows in humid, waterlogged conditions, preferring shallow water with a muddy or loamy substrate. The plant is adapted to tropical climates with consistent warmth and high humidity.

Leaves

• Large, broad, and elongated
• Glossy, deep green surface
• Texture is leathery
• Leaves can reach up to 50 cm long

Inflorescence (Spadix & Spathe)

• Creamy white spathe surrounding the spadix
• Tend to have a mild scent

Growth Habit

• Aquatic plant
• Grows either submerged or in shallow water

Light Requirements

• Bright, indirect light
• Can tolerate partial shade

Watering & Humidity

• Consistently moist conditions
• Should be watered regularly
• Ensure the soil remains damp but not waterlogged
• High humidity

Soil & Potting Mix

• A well-draining, loamy or aquatic mix
• Prefers soils that are rich in organic matter

Temperature & Fertilizer

• Temperatures ranging from 20°C to 30°C (68°F to 86°F
• Fertilizing once every 2-3 months with a balanced liquid fertilizer

Division and Stem Cuttings

• Division of the rhizomes
• Ensure each division has at least one shoot and a portion of the root system

Seeds

• Requires a controlled environment and patience
• Seeds need warm conditions to germinate

Typical Issues

• Aphids and spider mites
• Root rot

Treatment Recommendations

• Insecticidal soap or neem oil
• Remove affected roots
• Reduce watering frequency

• Plays a vital role in its natural wetland ecosystem
• Stabilizes the soil and providing habitat for aquatic organisms

• Large, attractive leaves and unique aquatic growth habit

Wild Population Status

• Faces some conservation challenges due to habitat loss and climate change
• Not currently classified as endangered

Market Availability

• Rare in cultivation
• Not widely available outside of specialty Aroid collections or botanical gardens