It is a slow-growing succulent, which usually does not exceed 10 cm in height and 6 cm in diameter. It has a column of triangular leaves arranged in 3 rows, slightly curved downwards. The color of the epidermis varies from dark green to almost black - a characteristic from which the name of the species derives. The foliage is densely covered with bumps that make the plant rough to the touch. During the flowering season (from late spring to summer), it produces white flowers. The Haworthia nigra, with its extremely ornamental appearance, is ideal for adorning any type of environment.