Lemna × japonica Landolt

• Genus: Lemna
• Botanical Background: Named by Landolt, this species has been studied for its unique reproductive strategies and minimalistic morphology, contributing to our understanding of aquatic plant evolution

• Geographical Range: Primarily found in temperate and subtropical regions of Asia
• Environment: Thrives in calm, nutrient-rich freshwater bodies such as ponds, ditches, and slow-moving streams. The plant favors warm temperatures, high humidity, and still water conditions

Leaves

• Small, oval, and smooth with a bright green coloration

Inflorescence (Spadix & Spathe)

• Flowering structures are minimal and rarely observed as the plant primarily reproduces vegetatively
• The inflorescences are reduced and inconspicuous

Growth Habit

• Aquatic, free-floating plant that forms dense mats
• Produces small, thread-like roots that help anchor the plant in the water without forming tubers or extensive rhizomes

Light Requirements

• Flourishes in bright, indirect light
• Full sun is acceptable if water temperature is moderated

Watering & Humidity

• Requires a consistent water environment
• Clean, nutrient-enriched water helps maintain healthy growth

Soil & Potting Mix

• Typically grown in shallow containers filled with water rather than traditional soil

Temperature & Fertilizer

• Ideal temperatures range between 15 and 30°C
• Diluted liquid fertilizer can be applied sparingly to support rapid growth during the active season

Division and Cuttings

• Propagation is mainly by vegetative budding
• Plant divides naturally, allowing easy expansion by simply transferring portions of the mat

Seeds

• Seed production is rare, conditions that promote flowering may lead to seed formation

Typical Issues

• Fungal growth and algal overgrowth

Treatment Recommendations

• Use natural water treatments or mild fungicides
• Regular water changes and ensuring good water hygiene

• Plays a significant role in water purification and environmental research
• Rapid reproduction makes it a popular subject in scientific studies

• Serves as a natural bioindicator in aquatic ecosystems

Wild Population Status

• Generally abundant in its natural habitats

Market Availability

• Widely available in aquatic plant collections and garden centers
• Ease of propagation contributes to its accessibility for hobbyists and researchers