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Lemna × japonica Landolt

Introduction & Overview

Common and Scientific Names

  • Scientific Name: Lemna × japonica Landolt
  • Common Name: Japanese duckweed

Quick Facts

  • Origin: Native to parts of Asia
  • Features: Rapid vegetative growth and ability to cover water surfaces; small size and ease of reproduction make it distinctive among aquatic plants

Taxonomy & Classification

  • 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

Natural Habitat & Distribution

  • 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

Morphological Characteristics

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

Cultivation & Care

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

Propagation Methods

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

Common Pests & Diseases

Typical Issues

  • Fungal growth and algal overgrowth

Treatment Recommendations

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

Notable Traits & Uses

  • 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

Conservation & Availability

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

References & Resources

Further Reading

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