Ceratopteris pteridoides

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

This species is strictly a floating plant and should not be buried in the substrate. It develops an extensive, trailing root system that hangs down into the water column.

Botanical form

Rosette

It has a unique, almost cabbage-like floating rosette with broad, fleshy, buoyant fronds. The dense, trailing roots provide an intricate, naturalistic network beneath the surface.

Growth

very-fast

The growth rate is remarkably fast, and a single plant can quickly cover a significant portion of the water surface. Constant removal of older growth is required to ensure light reaches the plants below.

Substrate

None

Ceratopteris pteridoides is predominantly a floating fern, requiring absolutely no substrate for its cultivation. It develops an extensive, dangling root system in the water column that excels at absorbing dissolved nutrients. The plant does not need to be rooted in soil or gravel, as it naturally drifts on the water's surface. Providing a nutrient-rich water column is far more critical for its success than any bottom substrate.

Column fertilization

Recommended

Since it floats, it relies entirely on water column fertilization to sustain its massive growth. It responds very well to regular liquid fertilizer dosing, especially in brightly lit environments.

Root fertilization

None

Root tabs and substrate fertilizers are completely inapplicable as the plant remains floating at the surface.

Trimming

Occasional

Maintenance consists of physically removing entire large plants or older, decaying fronds from the surface. The trailing roots can also be trimmed if they begin to interfere with the hardscape or swimming space.

Propagation

Division

It propagates prolifically by producing numerous small plantlets along the margins of its mature fronds. These detach naturally over time, quickly forming a dense floating mat.

Sensitivity

Moderate

It requires high humidity above the water surface to thrive and prevent its leaves from drying out. The leaves are quite brittle and can easily break if handled roughly or agitated by strong surface currents.

Layout role

Floating

It is an ideal floating plant for open-top aquariums or setups that require significant shading. Its roots are highly prized by breeders as spawning mops and sanctuaries for fry.