Hydrocotyle sp. "Japan"

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

This plant is incredibly versatile, primarily used as a carpeting foreground or draped over rocks and driftwood in the midground. When planted in the substrate, it should be pushed down gently to encourage lateral spreading. It forms beautiful, cascading bushes.

Botanical form

runner

It features distinct, deeply lobed, clover-like leaves that are slightly smaller than standard H. tripartita. The leaves are bright light green and grow densely along creeping runners. The compact nature of this variant makes it highly sought after.

Growth

Fast

Under high light and CO2, its growth rate is extremely fast and aggressive. It can easily overrun slower-growing plants if left unchecked. Frequent maintenance is required to keep it within its designated boundaries.

Substrate

Low

Hydrocotyle sp. "Japan" is an incredibly versatile creeper with low substrate demands, capable of attaching to rocks and wood just as easily as it roots into soil. When planted in the substrate, it favors fine gravel or standard aqua soil where its fine roots can effortlessly lock into the top few centimeters. The root nodes spread continuously along the surface, drawing moderate nutrients from the base while largely feeding from the water column. A shallow 2 cm layer of substrate is more than enough to secure this plant as it cascades or carpets the foreground.

Column fertilization

Recommended

It absorbs a large amount of nutrients directly from the water column. Dosing nitrogen, potassium, and iron regularly ensures healthy runners and prevents yellowing or pinholes. It responds visibly to improved water column fertility.

Root fertilization

None

While it feeds heavily from the water, it also roots vigorously into the substrate. A nutrient-rich aquasoil provides an excellent base for it to establish a thick, healthy carpet. Substrate fertilization promotes stronger root anchoring.

Trimming

Regular

Trimming can be aggressive; it can be cut like a hedge or thinned out by pulling up overlapping runners. Regular thinning is crucial to prevent the bottom layers from dying off due to light deprivation. Replanting the cuttings easily creates new clusters.

Propagation

Cuttings

Propagation is extremely easy by snipping any part of the runner that has a node and a leaf. These cuttings can be directly pressed into the substrate. It will also naturally propagate rapidly on its own via runners.

Sensitivity

Moderate

It is very hardy but can grow leggy and upwards if lighting is insufficient. It prefers cooler to moderate temperatures; excessively warm water may slow its growth. Algae can become an issue if the dense mats trap too much detritus.

Layout role

Foreground, Midground, Epiphyte, Nano

Its primary role is to provide a uniquely textured, bright green carpet or cascading accent. It is a staple in Nature Aquarium layouts, often used to soften the transition between hardscape and the foreground. Its clover-like appearance adds a whimsical touch.