Astrophytum myriostigma cv. Onzuka
Astrophytum myriostigma cv. ONZUKA
Astrophytum myriostigma cv. Onzuka is a japanese nursery produced cultivar.
A. myriostigma “Onzuka” is an Astrophytum characterised by the presence of many little white dots on its epidermis. Its stem looks maculated by these snowy-white markings, that are very variable from specimen to specimen. The markings appearance may vary during the plant aging.
This Astrophytum is a relatively easy-to-grow species. It needs a mineral, well-draining soil, with little humus. Water sparingly from March till October, letting the soil getting dry before watering again: be careful not to overwater, because this plant’s epidermis may crack. To avoid root rot, keep it dry from the beginning of autumn to the end of winter. It is theoretically hardy to -7°C, but during cold months keep it in a cool place. It does well from full sun to light shade.
Propagation can be done by seeds. They will need protection from strong lights, and to be kept well-watered. Until they get a diameter of 10 cm, they will need to be repotted frequently: after that, repotting can be done every 2-3 years.
Astrophytum myriostigma “Onzuka” was created in the 70s, probably by chance, by the japanese Mr. Tsutomu Onzuka.