Yakut (Lysimachia nummularia) or, as it is called, roostrate, coin box, coin box – aquarium plant of the Primul family or Primrose (Primulaceae).
Yakut prefers dampness, in nature it grows along the banks of ponds, streams and lakes, in Europe, North America and Japan in relatively dry meadows, gardens and pastures. Yakut It is cultivated not only as an ornamental plant, but is medicinal.
Shoots Loosestriker creeping above water and reaching a length of 60 cm, upright underwater in height about 25 cm. Roots are formed in the lower nodes of surface shoots.
The leaves have short petioles and are located opposite. Leaves moneybook up to 3 cm in length and about 2.7 cm in width, rounded in shape. Underwater leaves are painted in a light green color, above-water leaves have a yellow-green and green color.
In the period from May to July, the plant blooms with single above-water yellow flowers.
For optimum content coin boxes suitable water, the pH of which is 6.0-8.0, hardness from 6 to 15 ° and a temperature of 15-22 ° C. At a temperature higher than that, the shoots start to grow too fast, the internodes become longer, and the leaves become shallow. Yakut It needs regular replacement of 30% of the total water volume aquarium and powerful filtering.
Lighting for this plant should be bright. As a means of artificial lighting suitable fluorescent lamps, the power of which is 0.5 W / l. Duration of daylight hours is 12 hours.
Contain coin box it is also possible in a brightly lit plyudarium with a nutrient substrate, and also as a decorative ornament of personal plots and ponds.
Breeds loosestrife by rhizome division or layering.