Duckweed (several species)

Family: Araceae

Genus: Lemna

Difficulty

Very Easy

Light

Low to High

Growth Rate

Very Fast

Ideal Conditions

Temperature

4-30°C(opt: Not specified)

CO2

≤40mg/L

pH

5-9

Nutrients

Nitrate (NO3): 10-50mg/L

Phosphate (PO4): 0.1-3mg/L

Potassium (K): 5-30mg/L

Iron (Fe): 0.01-0.5mg/L

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Description

Lemna species, also known as duckweed, thrive in stagnant or slow-flowing waters worldwide. They often grow unnoticed in aquariums, hiding among other plants, making them difficult to eradicate. The most common species found are L. minor, L. minuta, L. valdiviana, and Landoltia (Spirodela) punctata. Some species can coexist in the same tank. Lemna minor, native to Central Europe, tolerates low pH values and cold temperatures. In winter, it produces turions, which sink to the ground, ensuring its survival during harsh conditions. Duckweed is a hardy plant that thrives with nutrient-rich water and medium lighting. It reproduces mainly through budding, producing daughter plants from "bags" on its sides. This rapid growth can lead to an overgrowth of duckweed, making it difficult to control. Water movement exacerbates this issue. Some fish, like goldfish and cyprinids, consume duckweed. Due to its high growth rate and shading capabilities, duckweed is not recommended for aquariums. However, it may be beneficial in tanks mimicking natural habitats or for raising young fish, as it provides hiding spots, reduces nitrate levels, and creates a natural environment with its vertical roots.