Myriophyllum spicatum

Scientific name: Myriophyllum spicatum

Family: Haloragaceae

Usual maximum size in aquariums: 20 - 70 cm (7.87 - 27.56 inch)

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Recommended pH range for the species: 6.3 - 7.7

Recommended water hardness (dGH): 5 - 23°N (89.29 - 410.71ppm)

0°C 32°F30°C 86°F

Recommended temperature: 20 - 27 °C (68 - 80.6°F)

Reproduction of the plant: Cuttings

Origin (in the wild): Europe

How fast these plants grow: Normal

Recommended substrate: Fine gravel

Demands on lighting: Medium

Ideal placement in a fish tank: Background

Family

Haloragaceae

Common Name

Spiked Water Milfoil

Origin

Myriophyllum spicatum originates from Eurasia, including Europe, parts of Asia, and northern Africa. It naturally grows in lakes, ponds, reservoirs, and slow-moving rivers. Due to its adaptability and rapid vegetative reproduction, it has become an invasive species in many other regions, especially North America, where it displaces native aquatic vegetation.

Growing Conditions

Myriophyllum spicatum grows best when fully submerged in water. It develops finely divided, feather-like leaves that form bushy, elegant whorls along the stem. In shallow ponds and wetlands, the plant may occasionally break the surface and produce small, reddish flowers, but it rarely grows emersed in aquariums.

This species prefers medium lighting and does well in nutrient-rich aquariums with a temperature range of 20 – 27 °C (68 – 80.6°F). It tolerates a wide pH range between 6.3 and 7.7 and water hardness from 5 to 23 dGH. Although CO₂ injection is not required, it can promote faster growth and denser foliage.

Planting Area

With a potential height of up to 70 cm (27.56 inches), Myriophyllum spicatum is ideal for the background of larger aquariums or for natural pond setups. It provides excellent shelter for small fish and fry and can also serve as a spawning area for some species. Regular trimming is advised, as it can grow quickly and overshadow other plants if left unchecked.

Propagation

Myriophyllum spicatum propagates easily through cuttings. Cut a healthy stem segment and remove the bottom leaves to expose a clean stem section. Carefully insert the cutting into fine gravel substrate. New roots will develop quickly, and the cutting will establish itself as an independent plant.

In the wild, this species also reproduces vegetatively by fragmentation — broken pieces float away, settle elsewhere, and grow into new plants. This trait contributes to its invasive nature.

Difficulty

Myriophyllum spicatum is considered easy to care for. Its adaptability to various water conditions and tolerance of medium lighting make it suitable for both beginner and experienced aquarists. However, its rapid growth and tendency to take over tanks or ponds require regular maintenance.

Short Description

Myriophyllum spicatum, also known as Spiked Water Milfoil or Eurasian Watermilfoil, is a fast-growing submerged plant appreciated for its soft, bushy appearance. It is excellent for creating a natural-looking aquascape and providing shelter for fry. Its feather-like leaves form beautiful green plumes that sway gently with water flow. Because of its vigorous growth and ability to spread via cuttings or fragments, it must be pruned regularly and disposed of responsibly to prevent unwanted spread — especially in outdoor ponds, where it can become invasive.

This plant is suitable for both aquariums and garden ponds. Use a tightly secured lid or netting in open tanks, as floating fragments may clog filters or spread unintentionally.

Image was provided by Oliver.