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Samolus floribundus

Samolus floribundus

Samolus floribundus is a charming and versatile midground plant, recognized for its vibrant green foliage and medium growth rate, making it an excellent choice for adding lush visual density to aquascapes. It thrives with moderate care, providing a stable and attractive element in various aquarium layouts.

Taxonomy
Class:Liliopsida
Order:Ericales
Family:Primulaceae
Genus:Samolus
Species:Samolus floribundus

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Water Temperature

20 - 28 °C

pH Value

6 - 7.5

Water type

Freshwater

Light

Medium - High

CO2

Medium - High

KH

2 - 10 dKH

Species description

Samolus floribundus, commonly known as Water Pimpernel, originates from a wide geographical range spanning North and South America, as well as parts of Europe, Asia, and Australasia. It is typically found in diverse wetland environments, including the margins of ponds, slow-moving streams, ditches, and even brackish coastal areas. This natural adaptability to varied conditions contributes to its resilience and relative ease of cultivation in the aquarium. Its presence in such dynamic habitats explains its ability to tolerate a range of water parameters. Classified within the family Primulaceae, Samolus floribundus holds a distinct position among aquatic flora, despite sometimes being mistaken for species from other genera due to its leaf morphology.

Care, breeding and tankmates

Samolus floribundus is quite adaptable to a range of water parameters, making it suitable for many community aquariums, but it thrives best within its specified ideal ranges. Maintain water temperatures between 20-28°C (68-82°F) to ensure consistent metabolic activity and avoid stress. A carbonate hardness (KH) of 2-12 dKH and a pH of 6.0-7.5 are recommended, as these parameters mimic its natural wetland habitats and support healthy nutrient uptake. Stability in these parameters is more crucial than hitting exact numbers, as sudden fluctuations can be detrimental to the plant's health. While generally hardy, Samolus floribundus can be susceptible to common aquatic plant issues if environmental conditions are not met.

Geographic Origin and Distribution

This species originates from: Cosmopolitan.

Origin

North AmericaExtra-Amazon South AmericaEurope, Mediterranean, and West AsiaSouth and Southeast AsiaEast AsiaAustralia, New Guinea, and Oceania

Plant profile

Placement
Midground

This plant is ideally suited for the foreground or midground of the aquarium due to its growth habit. When planted in groups, it forms a dense, attractive bush that provides a natural look. Ensure it is not shaded by taller plants, as it requires adequate light to thrive. Proper spacing allows for healthy horizontal expansion.

Botanical form
Rosette

It features narrow, grass-like leaves that add texture and movement to the aquascape. The leaves are typically bright green, providing a vibrant contrast to darker hardscape materials. Its rosette growth pattern allows it to spread outward naturally. This form makes it an excellent choice for creating carpet-like effects in the tank.

Growth
Medium

Under optimal conditions with sufficient light and nutrients, Samolus floribundus exhibits a moderate to fast growth rate. The addition of CO2 injection can significantly accelerate its development and improve overall health. Without CO2, growth will be slower but steady. Regular monitoring helps maintain its desired size and shape.

Substrate
High
Column fertilization
Recommended

While Samolus floribundus relies heavily on root nutrients, supplementing the water column with liquid fertilizers is beneficial. A comprehensive liquid fertilizer provides essential micronutrients that might be lacking in the substrate. Care should be taken not to over-fertilize, which can lead to algae blooms. Consistent, moderate dosing is the best approach.

Root fertilization
Recommended

Root tabs are highly recommended for Samolus floribundus to ensure it receives adequate macronutrients. Inserting root tabs deep into the substrate near the base of the plant promotes strong root development. These tabs should be replenished every few months to maintain nutrient levels. A nutrient-rich soil substrate can also serve this purpose effectively.

Trimming
Regular

Trimming Samolus floribundus is straightforward; simply cut older or decaying leaves at the base to encourage new growth. If the plant spreads too far, runners can be snipped and replanted or removed. Regular maintenance prevents it from overshadowing smaller foreground plants. Ensure sharp scissors are used to make clean cuts and avoid damaging the plant.

Propagation
Cuttings

Samolus floribundus propagates naturally through runners that extend from the mother plant. Once a runner has developed its own root system and several leaves, it can be separated. The separated plantlet can then be replanted in a new location. This efficient propagation method makes it easy to cultivate a large cluster over time.

Sensitivity
Moderate

This plant is generally hardy but can be sensitive to drastic changes in water parameters. It prefers stable temperatures and pH levels to avoid melting. Some chemical treatments, particularly copper-based medications, can negatively affect its health. Careful acclimation is required when introducing it to a new environment.

Layout role
Midground, group

In an aquascape, Samolus floribundus serves beautifully as a transitional plant between the foreground carpet and background stems. Its vibrant green hue draws the eye and softens the edges of rocks or driftwood. It provides excellent hiding spots for small fish and shrimp. Overall, it enhances the natural, layered aesthetic of the planted aquarium.

Image gallery

Licensed images linked to the species or, when marked, to the closest representative taxon.

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Last updated: 06/16/2026
Samolus floribundus Care Guide & Tank Setup | Atlarium