Water fern (Salvinia molesta)

Water fern

The water fern is aptly named. It grows on the surface of slow-moving water as free-floating plants. In some cases, it reproduces so prolifically that it can cover entire lakes. Because this Brazilian native can spread so rapidly, it is considered one of the most problematic invasive species in the world.

Scientific classification

Species

Water fern (Salvinia molesta)

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30 cm

Plant Height

5 cm

Spread

Evergreen

Leaf type

20 - 38 ℃

Ideal Temperature

Images of Water fern

Distribution of Water fern

Distribution Map

Water fern has an extensive geographical footprint, being native to South America but finding its way to various other continents such as Africa, Asia, Oceania, and North America. This plant has been introduced in several major regions around the globe. In numerous areas, water fern is sometimes thought to be a matter of concern due to its tendency to flourish in non-native habitats, which may have an impact on local ecosystems. Particularly in warmer climates, water fern is observed to establish quickly and could potentially disrupt delicate aquatic environments.

Native

Cultivated

Invasive

Introduced

No species reported

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Hemisphere Trend Curve

Northern

Sorthern

Quickly Identify Water fern

Floating oval leaves with velvety texture and air pockets for buoyancy, up to 2 inches (5 cm) across.

Branching horizontal stem, up to 6 feet (1.8 meters) long, slender with green to brown color, and hair-like structures.

Distinctive thread-like brown lower leaves resembling roots, growing up to 9 inches (23 cm) for drag.

Reproduction via compact sporocarps with hard, rounded form, brown color, and sterile spores for propagation.

Green upper leaves in whorls of three with small egg beater-like structures, 0.75 to 1.5 inches (2 to 4 cm) long.

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Care Guide for Water fern

Every week

Water

Full sun

Sunlight

20 - 38 ℃

Ideal Temperature

Water: Originating from tropical regions, water fern thrives in humid, moist environments. It requires weekly watering for optimal growth. As an aquatic fern, water fern can float on water surfaces, making it ideal for garden ponds, where it provides shade and habitat for aquatic life.

Fertilize: For water fern, use a balanced fertilizer monthly for regular care, with high-nitrogen types to boost growth. Adjust frequency seasonally, reducing in cooler months. Apply evenly to protect the aquatic ecosystem, ensuring vigorous health and flourishing leaves for both novice and seasoned gardeners.

Pruning: Water fern, known for rapid growth and invasiveness, requires careful management. Prune in early to late spring, trim dead fronds, and remove excess biomass to prevent blockage and spread. Use manual tools for precision to promote balanced growth and maintain a healthier ecosystem.

Propagation: Water fern is an aquatic floating fern that thrives in calm waters, forming dense mats due to its aggressive growth. Easy propagation occurs by placing node fragments on water. To manage growth and prevent invasiveness, provide sufficient light and avoid overcrowding.

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Images of Water fern

Distribution of Water fern

Quickly Identify Water fern

Care Guide for Water fern

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