Hemianthus Micranthemoides

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Hemianthus micranthemoides, commonly known as Pearl Weed, is a delicate, bright-green stem plant that produces dense growth when regularly trimmed. Its small rounded leaves create a soft, natural appearance and make it a versatile choice for planted aquariums.

Pearl Weed can be used as a midground plant, background bush or low-growing carpet when planted densely and trimmed frequently. Its flexible growth habit allows aquascapers to shape it into compact mounds or let it grow naturally between rocks and driftwood.

This plant is relatively adaptable and can grow in moderate lighting, although stronger lighting and carbon dioxide supplementation encourage denser growth, smaller leaves and improved overall form. Regular trimming helps prevent the lower stems from becoming shaded and bare.

Hemianthus micranthemoides is suitable for community aquariums, aquascapes and shrimp tanks. It provides shelter for small fish and shrimp while also helping create a lush, natural-looking aquarium.

Quick Care Guide

• Scientific Name: Hemianthus micranthemoides

• Common Name: Pearl Weed

• Type: Stem plant

• Origin: North America

• Growth Rate: Moderate to fast

• Difficulty: Easy to Moderate

• Lighting: Moderate to High

• CO₂: Recommended, but not essential

• Placement: Midground or background; can be trimmed as a carpet

• Growth Height: Approximately 5–30 cm

• Water Temperature: 20–28°C

• pH: 6.0–7.5

• Water Hardness: Soft to moderately hard

• Diet: Water-column nutrients and root-zone nutrients

• Propagation: Stem cuttings

• Suitable For: Planted aquariums, aquascapes and shrimp tanks

Frequently Asked Questions

Can Hemianthus micranthemoides be used as a carpeting plant?

Yes. When planted densely and trimmed regularly, it can form a low-growing carpet or compact foreground bush.

Does Pearl Weed require CO₂?

No, but CO₂ supplementation can improve growth, density and appearance, particularly under stronger lighting.

How should it be planted?

Separate the plant into small portions and plant the stems individually with tweezers. Leave enough space between portions to allow room for growth.

How do I trim Hemianthus micranthemoides?

Trim the tops with clean aquascaping scissors. Remove excess cuttings and replant healthy trimmings to create denser growth.

Why is the plant becoming tall and sparse?

This is usually caused by insufficient light, overcrowding or a lack of regular trimming. Increase light appropriately and prune the plant to encourage bushier growth.

Is it suitable for shrimp aquariums?

Yes. Its dense growth provides shelter and additional surfaces for biofilm, making it a useful plant for shrimp tanks.

Common Mistakes

• Planting large, tightly packed portions instead of separating the stems.

• Using insufficient lighting for the desired growth style.

• Failing to trim the plant regularly.

• Allowing the lower stems to become shaded.

• Neglecting water-column nutrients.

• Planting it in an aquarium with unstable water parameters.