Can I grow Pearl Weed without CO2 injection?

Yes, Pearl Weed can grow in low-tech setups without supplemental CO2. However, it tends to grow vertically rather than creeping, and its overall growth rate will be significantly slower.

How do I make Pearl Weed carpet?

To encourage carpeting, you need strong lighting. When light intensity is high, the plant tends to spread laterally across the substrate. Regular aggressive trimming of vertical shoots will also train it to grow outwards.

Why are the bottoms of my Pearl Weed stems dying?

This is usually caused by lack of light. If the top of the plant grows too thick, it shades out the lower stems, causing them to rot. Regular trimming ensures light reaches the bottom.

Is Pearl Weed the same as Monte Carlo?

No. While they belong to the same genus (Micranthemum), Monte Carlo (M. tweediei) has rounder leaves and a natural creeping habit even in moderate light, whereas Pearl Weed has narrower leaves and will grow tall if not trimmed.

Can I float Pearl Weed?

Yes, Pearl Weed can be left floating at the surface. It will grow quickly closer to the light and provide excellent cover for fry, though planting it in the substrate is preferred for aquascaping.

FreshwaterPlantsBeginner

Pearl Weed

Micranthemum micranthemoides

Pearl Weed is a fast-growing, highly versatile aquarium stem plant that can be shaped into a lush foreground carpet or maintained as dense midground bushes.

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Ideal Conditions

Temperature: 18 – 28 °C
pH range: 6 – 7.5
Hardness: 2 – 15 dGH
Adult size: 5 – 20 cm
Nano tank: 10 litres+
Lifespan: 1 – 5 years
Diet: Photosynthesis and water column fertilisation
Water flow: Low to moderate
Preferred setup: Fine-grained, nutrient-rich substrate is beneficial but not strictly necessary as it can feed from the water column.

About the Pearl Weed

Micranthemum micranthemoides, commonly known as Pearl Weed, is arguably one of the most flexible plants available to aquascapers. Unlike many demanding carpeting plants, its stems can adapt their growth habit based on lighting conditions—reaching toward the surface in lower light or creeping laterally under intense illumination. Its delicate, bright green foliage provides a wonderful textural contrast in planted tanks and serves as an ideal sanctuary for dwarf shrimp and nano fish.

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Where Pearl Weed comes from

Native range

Mid-Atlantic United States

Countries / regions

United States

Habitat

Tidal riverbanks, mudflats, and slow-moving streams

Believed to be extinct in the wild since 1941, though it remains globally abundant in the aquarium trade.

Similar species

Monte Carlo
Micranthemum tweediei
Dwarf Baby Tears
Hemianthus callitrichoides
Giant Baby Tears
Micranthemum umbrosum

We’re adding more full species guides as the catalogue grows.

Compatible tank mates

Reviewed guidance based on this species' recorded traits.

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Amano Shrimp
Caridina multidentata
They are excellent algae eaters that will keep the delicate leaves of Pearl Weed clean without damaging the plant itself.
Great
Cherry Shrimp
Neocaridina davidi
Densely grown Pearl Weed provides the perfect foraging ground and hiding space for breeding dwarf shrimp.
Great
Neon Tetra
Paracheirodon innesi
Small, peaceful fish that appreciate the cover provided by thick plant growth and will not disturb the stems.
Great
Silver Dollar
Metynnis argenteus
Notorious herbivores that will rapidly consume soft-leaved plants like Pearl Weed.
Not recommended
Goldfish
Carassius auratus
Goldfish are habitual foragers that will relentlessly uproot and eat the fine stems.
Not recommended

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