Micranthemum Umbrosum

Quick facts

Identity

Also known as

Giant Baby Tears; Baby Tears; Pearlweed's bigger cousin

Synonyms

Hemianthus micranthemoides (misapplied); Micranthemum nuttallii

Environment

Freshwater

Native to

United States, Central America

Habitat

Shallow, slow-moving freshwater streams, ditches, ponds, and marshy areas in the southeastern United States and Central America

Sourcing

Aquacultured

Conservation

Not Evaluated

Care

Care level

Easy

Growth form

Stem

Max height

2 – 6 in (5.1 – 15 cm)

Spread

12 in (30 cm)

Growth rate

Fast

Placement

Foreground, Midground, Background

Water

Temperature

68 – 82 °F (20 – 28 °C)

pH

6.0 – 7.5

GH

2 – 15 dGH

PAR

40 – 70 PAR

Flow

Moderate

Light

Medium

CO₂

Beneficial

Planting

Substrate

Nutrient-rich preferred

Feeds from

Both

Fertilizer needs

Medium

Colors

Green

Feeding & breeding

Propagation

Cuttings

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Care guide

Overview

Small round leaves grow in opposing pairs along thin, branching stems that spread low across the substrate when kept trimmed. Under medium to high light it stays compact and mounded; in dimmer setups it stretches with wider gaps between leaves. Easy to grow and shrimp-safe, it roots quickly from cuttings and benefits from weekly fertilizing.

Care

Giant baby tears is an undemanding stem plant that adapts to a wide range of freshwater setups, from low-tech tubs to bright CO2-injected scapes. Under medium to high light it stays compact with tight internodes, while dimmer conditions cause the stems to stretch and the paired round leaves to space out along them. Regular trimming every one to two weeks keeps the growth dense and encourages the lateral branching that gives it a mounded, carpet-like appearance in the foreground or midground.

Planting & trimming

Trim several stems to a few inches long, bundle several cuttings together, and bury the bare lower portion in the substrate so the leaves sit just above the surface. Plant in small clusters spaced an inch or two apart rather than one dense clump, which allows light and flow to reach the base and encourages faster carpet formation. Regular topping keeps the plant low and bushy; left untrimmed it will grow upright into a looser background bush.

Fertilizing

A weekly dose of a liquid all-in-one fertilizer supports steady growth, and root tabs pushed into the substrate near the base of the stems help anchor and feed the fine root system. Iron and micronutrient supplementation prevents the pale new growth and stunted tips that signal a deficiency. CO2 is not mandatory but noticeably improves density and recovery speed after heavy pruning.

Propagation

Propagation is simply done by cutting healthy stem tips and replanting them directly into the substrate, where they root within one to two weeks. Trimmed side shoots can also be left to float at the surface as a holding method before replanting. A single well-established stem can be divided repeatedly over time to fill out a tank.

Problems

New plantings often shed a few lower leaves as they adjust to submersed life, especially if the stock was grown emersed at the nursery; this settles once roots establish. Yellowing leaves or slowed growth usually point to insufficient nutrients rather than disease, and thin, leggy stems indicate the plant is reaching for more light. Diatom or green film algae can settle on the small leaves in low-flow, low-nutrient tanks, so improving circulation and dosing fertilizer more consistently usually resolves it.

Sources

1. Micranthemum Umbrosum Giant Baby Tears Live Aquarium Plant – Tropical Fish Imports
2. Giant Baby Tears Care Guide | Melbourne Tropical
3. Micranthemum umbrosum — Florida Aquatic Nurseries
4. Micranthemum Umbrosum – Nature Aquariums USA

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