Photo by Melody

PlantFiles: Anacharis, American Frog's Bit, Brazilian Elodea, Waterweed, Planchon
Egeria densa

Family: Hydrocharitaceae
Genus: Egeria (ee-JEE-ree-uh) (Info)
Species: densa (DEN-suh) (Info)

Synonym:Elodea densa
Synonym:Anacharis densa

8 members have or want this plant for trade.

Ponds and Aquatics

12-18 in. (30-45 cm)

Unknown - Tell us

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)
USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Late Summer/Early Fall

Unknown - Tell us

Other details:
May be a noxious weed or invasive
Very high moisture needs; suitable for bogs and water gardens

Soil pH requirements:
5.6 to 6.0 (acidic)

Patent Information:
Unknown - Tell us

Propagation Methods:
Unknown - Tell us

Seed Collecting:
Unknown - Tell us

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1 positive
2 neutrals
1 negative

Gardeners' Notes:

Neutral holeth On Apr 30, 2009, holeth from Corpus Christi, TX (Zone 9a) wrote:

This plant has escaped into many nearby streams, canals, etc. It forms densely vegetated areas in streams that previously had rocky bottoms. It is a problem.

Then again, land use changes gave it a better chance to invade:
> The trees/canopy were cleared along the banks of all of these habitats, letting in light.
> Nutrient sources abound. Non-point sources such as lawn fertilizers, and crop and pasture runoff are still problematic, despite major improvements. Trace nutrients need to meet trace levels.
> Land development re-routes runoff away from primary sources into storm sewers, which usually empty into larger rivers, often the one the streams meet...eventually. Diverting runoff slows the stream flow and reducing the total volume, making streams warmer with lower dissolved oxygen levels.

In the aquarium, this is one of the FEW plants capable of absorbing calcium, a major benefit to one who suffers from chronically hard water. Of the plants with that ability, it's the easiest to grow. Therefore, it's great for beginners with hard water...under the assumption that they don't dump their fishbowls into the local creek or pond when they're bored with "goldie."

Negative jdurha On Aug 26, 2004, jdurha from North Clarendon, VT wrote:

FYI: Egeria densa/ Brazilian Elodea is a Class A Noxious weed in Vermont. The importation, movement, sale, possession, cultivation and/or distributions is prohibited with fines upto $1000.00 possible

Positive pegkay53 On Sep 9, 2003, pegkay53 from Great Bend, KS wrote:

I have grown anacharis for about 35 years. I have grown it in aquariums and outside ponds. It does best outside in full sun. Mine has winter over in zone 5 with little or no damage, as long as the pond does not freeze to the bottom. Some is left floating on the top of the water, other I have planted into 5 gallon bucket. I use peat moss on the bottom 1/4 of the bucket, follow by a good potting soil to within about 4" of the top. You must put at least 3-4" of sand on top to prevent the peat and potting soil from floating. Break off 8" or longer stem, make a hole with finger or stick 3-4" deep and place the broked end in the hole and gently press the dirt around the stem. You can also just let it float on top of the water.

Neutral smiln32 On Aug 30, 2001, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

Egeria densa is a good plant for beginners, and its rapid growth helps create a balance in the aquarium from the start. It can also help prevent algae because it absorbs a great number of nutrients from the water. The plant secretes antibiotic substances which can help prevent blue-green algae (a type of bacteria). The growth rate depends largely on the amount of light and nutrition available. Growth does not stop in unfavourable conditions, but the plant turns light in colour and the tendrils grow thin.


This plant has been said to grow in the following regions:

Tuscaloosa, Alabama
Menlo Park, California
Orlando, Florida
Atlanta, Georgia
Cherry Valley, Illinois
Great Bend, Kansas
Holly Springs, Mississippi
Cleveland, Ohio
Lehigh Valley, Pennsylvania

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