Azolla Caroline (Azolla caroliniana) or, as it is called, water fern – aquarium plant of the azole family (Azollaceae).
Homeland Azolly Karolinska is North, South and Central America. But Azolla Caroline acclimatized in several areas of Asia.
It is also found in Europe, but quite rarely.
Azolla Caroline – It is a water fern, floating green islands on the surface of the water. It is tender aquarium plant needs careful handling. Water ferns are not particularly popular with aquarists.
When maintained in favorable conditions Azolla Caroline grows rapidly, fully tightening the surface of the aquarium, thereby creating a shadow for other plants. Therefore, it must be periodically “thinned out”, removing excess from aquarium.
Is growing Azolla Caroline seasonally, in the winter period of rest.
For content water fern suitable as an aquarium with a moderate temperature of water (from 20 degrees) and tropical with temperatures up to 28 degrees. In the case of lowering the temperature to 16 ° C, the growth of the plant stops, its leaves begin to rot and Azolla Caroline sinks to the bottom.
In the bottom sludge, the spores of this plant may remain and in the spring give life to a new fern. The water hardness in the aquarium should not exceed 10 °, the pH is less than 7.0, i.e. with a slightly acid or neutral reaction. Lighting aquarium in which it grows Azolla Caroline, should be very bright.
To create such a fluorescent lamp used LB capacity of 2-2.5 W / dm2 in combination with incandescent lamps.
Duration of daylight hours is 12 hours. In winter, the plant dies mainly due to a decrease in light.
Therefore, maintaining a high level of illumination and temperature in the aquarium can be maintained water fern and in the winter. Preservation Azollah Caroline can be provided in another way: put aquarium plant in wet moss, for example, swamp moss sphagnum is suitable for this. During wintering temperatures should not exceed 12 ° C.
At the end of March, the plant must be placed back in the aquarium.