Species description

Care, breeding and tankmates

Plant profile

Placement

Background

This plant is best suited for the background of the aquarium due to its rapid vertical growth. It can also be left floating at the surface where it provides excellent cover for fry. Planting it in dense bunches creates a thick, forest-like appearance.

Botanical form

Stem

Hydrilla features long, slender stems with whorls of 3 to 8 small, serrated leaves at each node. The leaves are typically a bright to medium green. It forms a dense, tangled mass if left to grow unchecked.

Growth

Fast

It possesses an incredibly fast growth rate, often considered invasive in many natural waterways. In the aquarium, it requires constant pruning to prevent it from shading out other plants. Its rapid growth makes it an excellent nutrient sponge for newly set up tanks.

Substrate

Medium

Hydrilla verticillata is a highly adaptable plant that readily anchors into almost any substrate, from basic sand and gravel to nutrient-rich soils. Its roots primarily serve an anchoring function, keeping the fast-growing stems secured to the bottom. While the plant extracts the majority of its nutrients straight from the water column, a substrate depth of 3-5 cm ensures the stems do not float away. Adding root tabs to an inert substrate can slightly boost its already vigorous growth rate.

Column fertilization

Recommended

It absorbs nutrients very efficiently through its leaves directly from the water column. Liquid fertilization is the most effective way to feed it. Even minimal dosing is often sufficient to keep it healthy.

Root fertilization

None

Root fertilization is generally unnecessary for this species. While it does produce roots to anchor itself, it relies primarily on water-borne nutrients. A nutrient-rich substrate is not required for its cultivation.

Trimming

Occasional

Aggressive and frequent trimming is required to manage its size. Stems can be cut anywhere along their length. The removed portions can be replanted to form new stands or discarded to export nutrients.

Propagation

Cuttings, Runners, Fragmentation

Propagation is effortless via stem fragmentation. Any small piece of stem with a single node can sprout into a new plant. Simply cut and replant the tops or let them float.

Sensitivity

Moderate

It is highly resilient and tolerates a wide range of water parameters, temperatures, and light levels. It is practically bulletproof in the aquarium setting. However, it can melt if exposed to sudden, extreme shifts in water chemistry.

Layout role

Background

Its main role is to provide a fast-growing, dense green background. It is highly functional for nutrient export and algae control in the early stages of an aquascape. Due to its wild appearance, it is mostly used in natural or biotope setups.