Herbaceous plant, a species of the genus Lunaria (Lunaria) of the Cabbage family (Brassicaceae). The annual lunnik, despite the name, grows for two years. In the first year, a rosette of leaves is formed, in the second year the bush blooms.
The stem is erect, 40-60 cm high, branched. The leaves are alternate, petiolate or sessile, ovate, broad, pointed, rough, covered with fine hairs.
At the ends of the stems, the flowers are collected in racemose inflorescences of white, purple or lilac color. Flowering occurs in the second year after sowing. The flowering period is May - June. In August, the plant bears fruit in the form of a pod, a flat rounded or oval box up to 3 cm in diameter.
Moon grass prefers open sunny glades, develops quite well in diffused light and in light shading, but at the same time loses its decorative effect. The annual lunnik is undemanding to the composition of the soil, grows on any sufficiently fertilized soil.