The minimum Salvinia is an aquatic fern native to central-southern America, the other species of this genus, about ten, are native to Europe, Asia and Africa. This plant is floating, and produces horizontal stems, originated from a short rhizome floating on the surface of the water, fleshy, green; at the stem internodes two floating leaves emerge, oval or heart-shaped, covered with a thick whitish down, which makes them water repellent, growing tend to roll up along the deep central vein, the lower page has a thin dark hair, are fleshy and thick; a third leaf is underwater, divided into thin filaments. The leaves are small, about 0.5-2.5 cm in diameter, and the plants tend to form large dense colonies. Salvinia molesta has leaves of much larger size, reaching 14-20 cm, which tend to pile up tightly, is one of the most intrusive and infesting aquatic plants, now widespread in the rivers of much of the globe.
These small ferns love bright locations, with areas of partial shade; if placed in very sunny places they tend to become darker, of a reddish color. They grow best in ponds or ponds with low depth, in small rivers with calm waters; the plants of Salvinia minimum do not fear the cold or even the drought of the summer season: when they are in the absence of water, due to the desiccation of the water or frost, the Salvinia they go into vegetative rest. To plant these plants, simply place them in a mirror of water and let them float.
As for reproduction, plants of minimal salvinia produce small sporocarps, "bags" containing spores, attached to submerged leaves, the spores of this fern are however sterile, probably because the minimum salvinia is a natural hybrid; these plants propagate by dividing the rhizomes, and can also be multiplied by taking portions of leaf or root, which develop in a single plant fairly quickly; Salvinia molesta develops naturally, even from small plant fragments, which develop leaves and rhizomes very quickly.
Reproduction by division is surely the most rapid reproduction method for this plant, through asexual, which gives rise to plants identical to the mother plant from the genetic point of view.
Minimum salvinia: Pests and diseases
Being aquatic species, particularly resistant, plants of minimum salvinia are not generally attacked by pests or diseases. The plants of minimum salvinia in their original environment are species that tend to expand very rapidly and weeds. In a short time they colonize most of the environments with suitable environmental conditions almost in purity.
Growing on the surface of the water areas, the Salvinia can create a thick layer of vegetation capable of making navigation very difficult, especially for small boats but not only. This species, if present in excessive quantities, can greatly reduce the amount of light to water and reduce the concentration of oxygen available to fish and other organisms.