Lemna perpusilla Torr.

• Genus: Lemna
• Botanical Background: Described by the botanist John Torrey, this species has been revisited in several botanical surveys. Its study has contributed to understanding aquatic plant evolution and the diversity within small floating plants.

• Geographical Range: Found in temperate to subtropical regions, thriving in still or slow-moving freshwater bodies across North America and parts of Asia.
• Environment: Thrives in nutrient-rich, calm waters with moderate to high humidity. It favors environments with full to partial sunlight and sediments that support its rapid growth.

Leaves

• Exhibits small, rounded to ovate fronds
• Smooth texture and a subtle green hue

Inflorescence (Spadix & Spathe)

• Flowering is rare in natural conditions
• Any inflorescence that appears is minimal and lacks a strong scent
• Pollination, when it occurs, is largely wind-assisted or opportunistic

Growth Habit

• Entirely aquatic, free-floating plant
• Does not form traditional tubers or rhizomes
• Growth is characterized by rapid clonal expansion on the water's surface

Light Requirements

• Optimal growth is achieved under bright, indirect light
• Can tolerate lower light conditions typical of shaded aquatic environments

Watering & Humidity

• Constant water immersion is essential
• Maintaining clean, slightly nutrient-enriched water helps support its growth

Soil & Potting Mix

• Cultivated in shallow water-filled containers
• Does not require a conventional soil medium
• Substrate that supports occasional nutrient supplementation is ideal

Temperature & Fertilizer

• Thrives in temperatures ranging from 18°C to 28°C
• Diluted, balanced fertilizer applied occasionally will support its rapid propagation without causing nutrient burn

Division

• Mainly achieved through vegetative division

Stem Cuttings (if applicable)

• New fronds bud from parent plants, they can be gently separated to start additional colonies

Seeds

• When seeds are produced, they require a warm, stable aquatic environment to germinate effectively

Typical Issues

• Fungal growth or root rot

Treatment Recommendations

• Maintaining clean water and ensuring adequate spacing
• Gentle organic treatments and improving water circulation

• Used in ecological studies as a bioindicator of water quality
• Rapid growth and clonal nature make it a model organism for studying aquatic ecosystems

• Unique appearance and ease of maintenance
• Ability to quickly form dense mats adds a dynamic, living accent to aquatic displays

Wild Population Status

• Not currently endangered, monitoring of natural populations is important

Market Availability

• Relatively easy to source through specialty aquatic plant suppliers and botanical exchanges
• Accessible for hobbyists and research collections