Lagenandra erosa de Wit

• Genus: Lagenandra
• Botanical Background: Described by botanist de Wit, contributing to the expansion of knowledge about the genus. The species name "erosa" refers to the jagged or erose margins of its leaves, which are a key identifying feature.

• Geographical Range: Native to tropical regions of South Asia, specifically found in wetlands and riverbanks in Sri Lanka and India.
• Environment: Thrives in humid, tropical climates with consistent moisture. It prefers soils that are consistently wet and can tolerate varying water depths. This species naturally grows at the edges of rivers and lakes, where high humidity and ambient moisture support its growth.

Leaves

• Large, elongated, and deeply lobed
• Margins are often jagged
• Surface can be smooth or slightly textured
• Bright green coloration
• Leaves can reach up to 30 cm long

Inflorescence (Spadix & Spathe)

• Features a typical Aroid spadix and spathe
• Spathe is usually pale or greenish
• Spadix being small and unassuming

Growth Habit

• Aquatic or semi-aquatic
• Grows from rhizomes that spread across the substrate
• Does not exhibit climbing behavior 
• Considered a creeping or stoloniferous species

Light Requirements

• Bright, indirect light
• Best suited for shaded to partially sunny areas

Watering & Humidity

• Consistently moist soil
• High humidity
• Can tolerate being submerged in shallow water

Soil & Potting Mix

• A well-draining, moist, and slightly acidic potting mix
• A mix designed for aquatic or bog plants

Temperature & Fertilizer

• Temperatures between 20-30°C (68-86°F)
• Fertilizing with a balanced, diluted liquid fertilizer once every month during the growing season

Division and Stem Cuttings

• Dividing the plant’s rhizomes
• Gently separate the rhizomes during the growing season
  

Seeds

• Less common but possible
• Seeds require moisture to germinate, and they should be sown in a damp substrate with high humidity

Typical Issues

• Aphids, mealybugs, and spider mites
• Root rot

Treatment Recommendations

• Insecticidal soap or neem oil
• Improve drainage
• Reduce watering until the soil dries out
• Isolate the plant to prevent further spread

• Aesthetic appearance and aquatic nature
• Less commonly seen in private collections

• Striking foliage, particularly the unique, jagged leaf margins

Wild Population Status

• No significant conservation concerns
• Habitat can be threatened by wetland drainage and pollution

Market Availability

• Rare in the horticultural market
• Can be found in specialty aquatic plant stores or through online Aroid dealers