Pearl Weed: Hemianthus micranthemoides
The most versatile plant in the hobby. Can be carpeted, trimmed into a bush, or grown as a background stem.

Pearl Weed
Pearl Weed, scientifically known as Hemianthus micranthemoides, is an enchanting aquatic plant that plays a crucial role in aquascaping. With its delicate, small leaves, this species creates a lush carpet effect, making it an ideal choice for foreground planting. The leaves are vibrant green and often appear to have a pearl-like sheen, hence the name. When allowed to thrive, Pearl Weed can quickly cover the substrate, providing not only a visually appealing aesthetic but also essential habitat for smaller aquatic organisms.
Care Guide
Maintaining Pearl Weed requires a balance of proper lighting, water conditions, and pruning. Follow these guidelines to ensure robust growth:
- Lighting: Provide moderate to high lighting for at least 8 to 10 hours a day. Excessive light may lead to algae growth, so be prepared to adjust accordingly.
- Water Conditions: Maintain a pH level between 6.0 and 7.5, with a temperature range of 20°C to 28°C (68°F to 82°F). Regular water changes are essential to remove accumulated nutrients that can disrupt the balance.
- Pruning: Regular trimming is necessary to encourage bushier growth and prevent the plant from overshadowing nearby specimens. Trim the tops of overgrown stems, allowing new shoots to develop.
Nutrient Requirements
The health of Pearl Weed is closely linked to its nutrient intake:
- Light: High-quality, full-spectrum lighting will enhance photosynthesis, promoting lush growth.
- CO2: Supplementing with CO2 is highly recommended, especially in higher light environments. A CO2 concentration of 20-30 mg/L is ideal for optimal growth.
- Fertilization: Employ a comprehensive fertilization approach, utilizing both liquid fertilizers and root tabs to provide essential minerals. Micro and macro nutrients should be adequately balanced to prevent deficiencies.
Natural Biomes
Hemianthus micranthemoides is native to several aquatic biomes, including:
These regions suggest a habitat characterized by slow-moving waters, warm temperatures, and rich sediment.
Livestock Compatibility
Pearl Weed is particularly well-suited for community tanks, as it provides excellent cover for small fish and shrimp. Compatible species include:
- Neocaridina (Cherry Shrimp)
- Caridina (Crystal Red Shrimp)
- Small schooling fish such as Neon Tetras and Ember Tetras
These inhabitants will thrive in the protective environment and spaces that Pearl Weed creates, enhancing both the ecological balance and visual dynamics of your aquascape.