Red azolla (Azolla filiculoides)
Care, watering, light and tips for Red azolla on Floravia.
Quick facts
- Family: Salviniaceae
- Difficulty: Moderate care
- Watering: every 1 days
- Light: Partial shade
- Temperature: 10–30 °C
About Red azolla
Azolla filiculoides, commonly known as water fern or mosquito fern, is a small, free-floating aquatic fern that forms dense green mats on the water's surface. Its tiny leaves, which can turn reddish under strong light, make it ideal for ponds, freshwater aquariums, or as a living groundcover in still water bodies. It's an excellent plant for adding a natural touch and controlling algae in aquatic environments.
Native range
Tropical and subtropical Americas
Care tips
It requires bright sunlight to partial shade for optimal growth, avoiding dense shade which can inhibit its development. No substrate is needed as it floats freely on the water, absorbing nutrients directly from the aquatic environment. Ensure the water is nutrient-rich and avoid the presence of surface oils or films that could impede its buoyancy. A common mistake is allowing it to spread unchecked in open water bodies, as it can become invasive.
How to save a dying Red azolla
- Warning signs
- Leaves losing bright green, turning reddish or yellowish, and sinking. Stunted growth.
- First aid
- Ensure fresh water, nutrients (nitrogen), and indirect sun. Remove competing algae or plants.
- What kills it
- Stagnant, polluted water, lack of nitrogen, excessive shade, or competition from algae.
- Can it be saved?
- Yes, if you act quickly. It needs a clean, nutrient-rich aquatic environment to recover.