Najas guadalupensis 'Guppy Grass' (Guppy Grass)

01 October 2026

Guppy Grass is a fast-growing, delicate submerged stem plant identified here as Najas guadalupensis 'Guppy Grass'. It produces narrow, flexible green leaves along branching stems and forms dense cover for small fish and fry. It is generally undemanding, grows floating or planted, and can quickly fill open water. The exact horticultural distinction of the quoted form cannot be confirmed from the supplied material alone.

Najas guadalupensis 'Guppy Grass' (Guppy Grass)

Identification

This plant is identified from the supplied source label as Najas guadalupensis 'Guppy Grass'. It has slender branching stems and narrow, soft leaves arranged along the stems. The species identification is plausible, but distinguishing a named aquarium form from ordinary Najas guadalupensis may require verified provenance or specialist examination.

Placement and growth

Use Guppy Grass as a background or supporting plant, or allow it to float beneath the surface. It provides dense shelter for fry and small fish. In good conditions, stems can rapidly form a loose tangle and may reach approximately 10 to 50 cm, depending on trimming and aquarium depth.

Water and lighting

Provide stable aquarium conditions, moderate light, and some water movement without excessive turbulence. Guppy Grass usually grows without added carbon dioxide, although consistent carbon availability and balanced fertilisation can increase growth. It tolerates a range of typical freshwater conditions; avoid abrupt changes and prolonged darkness.

Planting and propagation

Separate the material into small stem groups and anchor the lower portions lightly in the substrate, or leave the stems floating. Propagation is straightforward: cut healthy stem sections and replant or float them. New shoots can also develop from nodes on established stems.

Maintenance

Trim regularly to prevent the plant from shading itself and blocking circulation. Remove yellowing or decaying pieces during maintenance, and thin dense clumps so fish can move through them. Loose fragments may spread around the aquarium, so collect unwanted cuttings rather than discarding them into natural waterways.

Plant info

Colors: Green, Light green
Difficulty: Easy
Origin: North America
Usage: Supporting plants
Type: Submerged stem plant
Growth rate: Fast
Height: 10-50 cm
Light demand: Medium
CO2: Low

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Najas guadalupensis (Guppy Grass)

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