Long Leaf Salvinia care guide
Long Leaf Salvinia (Salvinia oblongifolia) — low light, 20-28 °C, pH 6-8, no CO2.
Compiled by Aquairi from published sources · Published · Updated
Overview
Long Leaf Salvinia (Salvinia oblongifolia) is an aquatic plant of the family Salviniaceae, listed in the Aquairi knowledge base as a beginner-level species. It is typically grown under low light and without obligatory CO2 injection on any substrate. Salvinia with elongated leaves giving an unusual textured surface mat. Tolerates lower light than other salvinias; great for low-tech tanks needing surface coverage.
Taxonomy
- Family: Salviniaceae
- Genus: Salvinia
- Scientific name: Salvinia oblongifolia
Habitat
Salvinia is a genus of free-floating ferns (Salviniaceae) of still and slow tropical waters; the paired water-repellent upper leaves keep the plant afloat while a submersed leaf acts as a root. In the Aquairi knowledge base, populations associated with this form are recorded from South America.
Growth requirements
- Lighting: low
- CO2: not required
- Temperature: 20-28 °C (68-82 °F)
- pH: 6-8
- GH: 3-14 °dGH
- Substrate: any
- Maximum height: 5 cm
- Growth rate: medium
- Recommended placement: floating
Placement
A floating plant that forms a surface mat, diffusing light and providing shade and shelter for surface-dwelling fish and fry. In the Aquairi knowledge base this form is recommended for the floating layer under low light and without obligatory CO2 injection, using any substrate.
Propagation
Spreads vegetatively by fragmentation, with each detached portion continuing to grow; colonies expand quickly in warm, bright, calm water. Documented propagation techniques for this entry include: adventitious plantlets on flower stalks.
Common issues
Dense mats block light and gas exchange and must be thinned; some species are invasive weeds and should never be released to natural waters.
Propagating Salvinia oblongifolia (Long Leaf Salvinia)
Overview
Salvinia oblongifolia belongs to the genus of free-floating aquatic ferns in the family Salviniaceae. Like its relatives it bears its leaves in three-part whorls — two floating green leaves and one finely dissected, root-like submerged leaf — and has no true roots. Hairlike trichomes on the floating leaves keep the surface water-repellent. Its leaves are noticeably elongated, giving an unusual textured surface mat.
It tolerates lower light than many salvinias, which makes it a good surface cover for low-tech tanks. Given enough light and nutrition it still grows quickly and shades the water below.
Propagation Method
Propagation is vegetative, by fragmentation and division of the branching floating stems. As the stems bud and branch, separated pieces grow on as independent daughter plants. Cuttings, spores and sporocarps are not needed for the home aquarium — simply divide the mat.
Step-by-Step
- Pick a dense, healthy section of the floating mat with firm elongated leaves.
- Separate the branching floating stems into smaller daughter pieces by gentle pulling; each piece with several leaves will continue to grow.
- Lift the fragments out with a cup or net so the water-repellent leaves stay dry-side up.
- Float the daughter pieces on the surface of the new tank, leaves uppermost.
- Keep surface current weak at first so the light fragments are not pushed underwater or against the glass.
Conditions for Healthy Growth
- Lighting: low light is tolerated; more light increases growth speed.
- CO2: not required.
- Temperature: roughly 20–28 °C is comfortable.
- Nutrients: fed from the water column; pale, light-coloured leaves indicate a micronutrient shortage.
- Flow: calm water with minimal surface current is best.
Maintenance
Thin the mat on a regular schedule so it never seals the whole surface; this keeps light reaching the bottom and maintains gas exchange. Use the removed long-leaf clumps as propagation stock for other tanks.
Common Challenges
- Pale leaves: a micronutrient deficiency; add a complete liquid fertiliser.
- Leaves wetting and sinking: strong surface flow or splashing breaks the hydrophobic hair layer — calm the surface.
- Over-coverage: even a low-light salvinia can spread fast, so trim before it shades out bottom plants.