Last Updated: July 2026
If you’ve found a bright green, bushy plant covering the bottom of your pond that feels rough or gritty and has a distinct earthy or garlic-like odor when crushed, you’re likely looking at chara (Chara spp.), commonly called muskgrass.
Although many pond owners mistake chara for an aquatic weed—or even an algae bloom—it’s actually a large, complex macroalga. Unlike nuisance filamentous algae, chara often indicates good water quality and can provide important ecological benefits. However, when it forms dense underwater meadows, it can interfere with fishing, swimming, and boating.
This guide explains how to identify chara, understand its role in your pond, and determine when management may be appropriate.
Quick Identification
Scientific Name: Chara species
Common Names:
- Chara
- Muskgrass
- Stonewort (sometimes used interchangeably, though true stoneworts include several related genera)
Identification Checklist
✓ Completely submerged
✓ Bright green to grayish green
✓ Branches arranged in circular whorls
✓ No true leaves
✓ No flowers
✓ Rough or gritty texture
✓ Distinct garlic or musky odor when crushed
✓ Usually grows attached to the pond bottom
What Does Chara Look Like?
At first glance, chara resembles a submerged aquatic plant. On closer inspection, however, it lacks true leaves, stems, roots, and flowers.
Instead, chara consists of long, flexible stems with evenly spaced whorls of slender branches, giving it the appearance of a bottle brush or miniature underwater pine tree.
One of its most distinctive characteristics is its rough texture. Many species deposit calcium carbonate on their surfaces, making the plant feel gritty or even slightly crunchy. This calcification is one reason chara is often called stonewort.
When crushed, chara releases a strong musky or garlic-like odor that easily distinguishes it from most aquatic plants.
Is Chara a Plant or an Algae?
This is one of the most common questions pond owners ask.
Although chara looks like a submerged plant, it is actually a green macroalga. It belongs to a group of algae that are evolutionarily much more complex than common filamentous algae.
Unlike flowering aquatic plants:
- It has no true roots.
- It has no flowers.
- It does not produce seeds.
- It reproduces primarily through spores and vegetative growth.
Because of its size and appearance, chara is often mistaken for pondweed, coontail, or southern naiad.
Where Does Chara Grow?
Chara is found throughout much of North America.
It commonly grows in:
- Farm ponds
- Fishing lakes
- Spring-fed ponds
- Clear reservoirs
- Limestone lakes
- Slow-moving streams
It is especially common in ponds with:
- Clear water
- Good sunlight penetration
- Moderate to high alkalinity
- Firm sediments
Unlike many nuisance plants, chara often dominates in ponds with relatively good water quality.
Why Does Chara Grow?
Several conditions favor chara growth:
- Excellent water clarity
- Sunlight reaching the pond bottom
- Moderate nutrient levels
- Stable water levels
- Alkaline water
- Hard water with abundant calcium
Because it competes effectively with other algae and aquatic plants, chara can actually help prevent more troublesome vegetation from becoming established.
Is Chara Good or Bad?
In many ponds, chara is actually beneficial.
Benefits
Moderate amounts of chara provide numerous ecological advantages:
- Stabilizes bottom sediments
- Reduces water turbidity
- Competes with nuisance algae
- Provides habitat for aquatic insects
- Serves as cover for juvenile fish
- Produces oxygen during daylight
- Helps maintain water clarity
- Can reduce phosphorus release from sediments by trapping fine particles and promoting calcium precipitation in hard-water systems
Many fisheries biologists consider moderate chara growth to be a sign of a healthy pond ecosystem.
Problems
Dense chara beds may:
- Interfere with casting and fishing
- Make swimming unpleasant
- Restrict boat movement
- Entangle fishing lures
- Cover large areas of shallow ponds
- Create oxygen demand if large areas die suddenly after treatment
How to Tell Chara from Similar Species
Chara vs. Coontail
Chara
- Rough texture
- Garlic or musky odor
- No true leaves
- Calcified surface common
Coontail
- Soft texture
- No odor
- Forked leaves
- Flowering aquatic plant
Chara vs. Southern Naiad
Southern naiad has true leaves with tiny serrated edges and is rooted in sediments.
Chara has no true leaves and feels rough because of calcium deposits.
Chara vs. Filamentous Algae
Filamentous algae forms slimy floating mats or cotton-like masses.
Chara grows upright from the pond bottom in organized, plant-like structures.
How Does Chara Spread?
Chara spreads through:
- Vegetative fragments
- Specialized reproductive structures called oospores
These durable spores can remain viable in pond sediments and germinate when environmental conditions become favorable.
Because of this, chara often reappears even after successful short-term control.
Best Management Options
Not every pond requires chara control.
If chara occupies only part of the pond and does not interfere with recreation or fisheries management, leaving it alone is often the best choice.
1. Nutrient Management
Although chara tolerates relatively low nutrient conditions, reducing excessive phosphorus inputs remains one of the best long-term pond management practices.
Good watershed management benefits the entire pond ecosystem.
2. Mechanical Removal
Small infestations around:
- Swimming beaches
- Boat docks
- Fishing areas
can often be controlled with aquatic weed rakes or mechanical harvesters.
Remove harvested material from the shoreline to prevent nutrients from recycling into the pond.
3. Biological Control
Triploid grass carp generally do not prefer chara compared to many submerged aquatic plants. While they may consume some chara when preferred vegetation is scarce, they should not be relied upon as the primary management tool.
4. Chemical Control
Copper-based algaecides have traditionally been used for chara control because chara is an alga rather than a flowering plant.
Depending on local regulations and pond conditions, other registered aquatic algaecides may also be effective.
Large infestations should generally be treated in sections to reduce the risk of dissolved oxygen depletion following decomposition.
Always read and follow the product label and observe any water-use restrictions.
Does Aeration Affect Chara?
Aeration does not directly eliminate chara.
However, improved circulation and oxygenation contribute to overall pond health.
Interestingly, chara often thrives in well-managed ponds with good water quality. For that reason, installing an aeration system should not be expected to reduce established chara populations.
Frequently Asked Questions
Is chara an algae?
Yes. Chara is a complex green macroalga, not a flowering aquatic plant.
Why does chara smell like garlic?
The distinctive musky or garlic-like odor is one of chara’s defining characteristics and is the source of the common name “muskgrass.”
Is chara good for fish?
Yes. Moderate amounts provide valuable habitat, shelter, and food resources for aquatic organisms.
Does chara indicate clean water?
Often, yes. Chara commonly grows in relatively clear, well-balanced ponds and lakes, although it can also occur under other conditions.
Should I remove all of it?
Usually not. Moderate chara growth is generally beneficial. Management is typically recommended only when dense beds interfere with recreation or pond use.
Key Takeaways
Chara is a beneficial macroalga that is frequently mistaken for an aquatic weed. It is easily recognized by its rough texture, whorled branching pattern, and distinctive musky odor when crushed.
While excessive growth can interfere with recreation, moderate populations often improve water clarity, stabilize sediments, and provide excellent habitat for fish and aquatic life. Before considering control, determine whether chara is truly causing a problem or simply serving as an important part of a healthy pond ecosystem.
For many ponds, the goal is not to eliminate chara—but to maintain a balanced ecosystem where it remains a beneficial component rather than becoming overly abundant.