globose cactaceae, with a flattened, small size, originating from South America; this genus has about 10-12 species. The body is rounded, with a diameter close to 10-15 cm in adult specimens, less than 10 cm high, of dark green color, crossed by numerous ribs; the small areolas carry few grigistre thorns, very sharp. In the age between 7 and 10 years the plants develop a small cephalium, consisting of light fluff, from which the flowers will bloom; the discocactus bloom in summer, producing numerous white flowers, delicately scented, which last a few hours, but bloom in succession.
place in a bright place, but not exposed to direct sunlight during the hottest hours of the day; they can withstand temperatures close to zero, but it is advisable to keep them at around 10-15 ° C even in winter, so they should be collected at home or in a temperate greenhouse.
from March to October water regularly, leaving the soil to dry very well between one watering and another; in the cold months water sporadically, every 40-45 days; the plants kept in a cold greenhouse should not be watered until the following spring. During the vegetative period mix the specific watering water for succulent plants with the water, every 15-20 days.
In nature these cacti grow solitary in areas with siliceous soils; an ideal substrate is constituted by sand and peat in equal parts, to which it is advisable to add fine gravel and pumice stone. Given the small size and slow growth, these plants should be grown in small containers and rarely repotted.
Discocactus: Multiplication and Pests and Diseases
Multiplication: occurs by seed, in spring; the seedbeds should be kept constantly humid, and in a protected and shaded place.
Pests and diseases: excessive watering or poorly draining soil can favor the onset of root rot.