PlantFreshwaterEasy
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Hemianthus micranthemoides
Hemianthus micranthemoides
Amphibious stem plant from the US offering delicate, bright green foliage. Requires medium-high light and CO2 to create dense and compact bush formations.
Water Temperature
20 - 28 °C
pH Value
5 - 7.5
Water type
Freshwater
Light
Medium - High
CO2
Medium - High
GH
0 - 20 dGH
KH
0 - 14 dKH
Species description
Geographical Origin and Habitat: Native to the eastern United States, where it inhabits wet coastal plains, riverbanks, and slow-moving streams. It is an amphibious species that thrives in both submerged and emersed conditions.
Taxonomy & Genetics: Belonging to the family Linderniaceae and genus Hemianthus. It is often confused with Micranthemum umbrosum but can be distinguished by its narrower, lanceolate leaves arranged in whorls.
Physical Structure: Characterized by thin, upright or creeping stems that form dense cushions. The tiny leaves are oblong or lanceolate, growing in whorls of three or four along the stems.
Color & Texture: Features a bright, light green color that brings a fresh look to the aquascape. The texture of the plant mass is very fine and soft, making it excellent for creating contrast in the layout.
Care, breeding and tankmates
Lighting & CO2: Requires medium to high lighting to prevent leggy growth. While not strictly mandatory, CO2 injection is highly recommended to achieve dense, compact, and healthy bush formations.
Nutrition & Substrate: Thrives in nutrient-rich substrates and benefits from regular
Water Chemistry: Prefers soft to medium-hard water with a pH of 6.0 to 7.5. The temperature should ideally range between 18°C and 28°C (64°F - 82°F).
Space Management & Placement: Highly versatile; can be placed in the foreground (with regular
Pruning: Very tolerant of pruning. Trim the stems regularly with sharp scissors to encourage lateral branching, which creates a bushy, compact appearance.
Risks & Diseases: If left untrimmed, the lower parts of the stems can die off due to lack of light. Its dense growth can easily trap detritus and harbor filamentous algae if flow is low.
Geographic Origin and Distribution
Native to the eastern United States, where it inhabits wet coastal plains, riverbanks, and slow-moving streams. It is an amphibious species that thrives in both submerged and emersed conditions.
Origin
North America
Plant profile
- Placement
- Midground
- Its placement is highly flexible, making it suitable for foreground carpets, midground bushes, or delicate background textures in nano aquariums. When planted densely and kept trimmed, it forms a bright green cushion that fits well in the midground. If left to grow taller, its delicate stems provide an excellent soft background.
- Botanical form
- Stem
- This stem plant features tiny, teardrop-shaped bright green leaves that typically form in pairs or whorls along thin, delicate stems. Depending on the lighting, it can grow straight up or creep laterally along the substrate. The small leaf size adds a fantastic sense of scale to aquascapes, making spaces appear larger.
- Growth
- Medium
- In high-tech aquariums with abundant light, CO2, and fertilization, its growth rate is extremely fast, requiring weekly maintenance. Without CO2, it still grows reliably, though the pace is notably slower and the stems may become more elongated. Its prolific nature makes it an excellent candidate for quickly filling out new aquascapes.
- Substrate
- Medium
- Hemianthus micranthemoides, commonly known as Pearl Weed, establishes a strong root system when planted in a fine to medium-grained substrate. A nutrient-rich aqua soil is highly beneficial for this species, fueling its rapid growth and helping it form a dense carpet or thick bush. A substrate depth of 4-6 cm provides the necessary space for its roots to spread and anchor properly. In inert substrates, regular root fertilization is recommended to maintain its delicate stems and light green leaves in top condition.
- Column fertilization
- Recommended
- Water column dosing is critical for this species, as its small leaves are highly efficient at taking up dissolved nutrients. A complete liquid fertilizer routine will keep the leaves vibrant and prevent stunting. Maintaining good water flow is also essential to deliver these nutrients evenly across its dense bushes.
- Root fertilization
- Recommended
- While it draws heavily from the water column, a nutrient-rich substrate like aquasoil encourages strong root development and overall plant health. Root tabs are beneficial if the plant is grown in inert gravel or sand. A robust root system helps anchor the buoyant stems securely, preventing them from floating away.
- Trimming
- Regular
- Pearl Weed requires regular pruning to maintain its shape and prevent the lower portions from becoming shaded and dying off. It responds beautifully to hard trimming, branching out at the cut points to become even thicker. You can use curved scissors to sculpt it into domes, paths, or structured hedges.
- Propagation
- Cuttings
- Propagation is straightforward; simply cut the upper portions of the stems and replant them directly into the substrate. The cuttings will root quickly, usually within a few days, and resume active growth. Floating trimmings can also be left to grow roots before planting if desired.
- Sensitivity
- Moderate
- It can be prone to melting if subjected to sudden drops in temperature or drastic swings in water chemistry. Inadequate lighting will cause the stems to become leggy and the lower leaves to rot. High organic waste or poor flow within its dense thickets can sometimes lead to hair algae infestations.
- Layout role
- Foreground, Midground, Nano, group
- It is an exceptional transitional plant, effectively bridging the gap between low foreground carpets and taller background species. Its fine, bright green texture softens the hard edges of rocks and driftwood in Iwagumi and nature aquarium styles. Additionally, its dense structure provides ideal spawning grounds and hiding places for shrimp and fry.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
