Najas guadalupensis

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

Extremely versatile; it can be planted in the substrate, attached to hardscape, or left to float freely. It typically occupies the midground to background when planted, creating thick, bushy clusters. It's famous for being a staple in breeding setups.

Botanical form

Stem

Composed of slender, brittle stems bearing narrow, slightly serrated leaves. The coloration ranges from deep green under lower light to a lighter, slightly yellowish-green under intense illumination. It naturally forms dense, tangled mats.

Growth

very-fast

Boasts an incredibly fast growth rate under almost any lighting condition. It will quickly fill available space, necessitating regular harvesting. Growth is even more explosive with added CO2 and high light.

Substrate

None

Column fertilization

Recommended

Derives almost all its nutritional requirements directly from the surrounding water. It is a highly efficient column feeder, outcompeting many algae types for nutrients. Occasional dosing of trace elements can improve its coloration.

Root fertilization

None

Root fertilization is completely unnecessary as the root system is minimal and serves only to anchor the plant weakly. It grows just as well, if not better, when floating without substrate contact.

Trimming

Regular

Maintenance is as simple as grabbing a handful and snapping or cutting it away. Because the stems are so brittle, be prepared to net out small floating fragments after trimming. Regular thinning prevents it from choking out other species.

Propagation

Cuttings

Effortless propagation through simple fragmentation. Every broken piece, no matter how small, has the potential to develop into a full plant. This makes it both easy to share and sometimes difficult to completely eradicate.

Sensitivity

Moderate

Known to be very sensitive to liquid carbon products (like glutaraldehyde), which can cause it to melt rapidly. It is otherwise incredibly hardy and tolerates a wide range of water parameters and temperatures.

Layout role

Midground, Background

Ideal as a functional utility plant for fry survival, shrimp grazing, and water quality management. While less common in formal aquascapes due to its messy growth habit, it provides a natural, wild look when allowed to bush out.