Origin and Habitat: Garden origin (Nursery produced cultivar)

• Astrophytum hybrid MY-OR (A. myriostigma x A. ornatum)

• Astrophytum hybrid ONZ-OR (A. myriostigma cv. Onzuka x A. ornatum) cv. White Zebra
• Astrophytum hybrid cv. Curlispine

Description: Plants obtained by controlled pollination of ♀Astrophytum myriostigma x ♂Astrophytum ornatumSN|3660]]SN|3660]].
Many very different Astrophytum hybrids have been developed involving Aatrophytum myriostigma & Astrophytum ornatumSN|3660]]SN|3660]] and are now in cultivation. The superb feature of some of this hybrids is due to the intersection between the traits of the ancestors and make them very desirable. Ribs are sharp usually eight (like in A. ornatum) and are spineless (or whit very short spines) clearly indicating the relationship with A. myriostigma.
This hybrid are strong growing. The flower are also very beautiful.
Remarks: Compare with the inverse hybrid which is similar but with spines. Astrophytum hybrid OR-MY

Cultivation and Propagation: It is relatively easy to grow. It is sometime seen as a grafted plant but grows very well on its own roots too. Use mineral well permeable substratum with little organic matter (peat, humus). The Astrophytum myriostigma grows much faster with a low nitrogen content fertilizer in spring and summer. Water sparingly from March till October, the thin, fibrous roots suffer if there is humidity, therefore the plant should be watered only when the surrounding terrain is dry. Keep dry as soon as the temperature starts dropping in October and keep it perfectly dry in winter at temperatures from 5 to 15 degrees centigrade. (but it is Hardy to -7°C for short periods) Although it is one of the easier Astrophytum to grow, they tend to rot at that time of the year, if kept wet. In the rest period no high atmospheric humidity!! Sun Exposure: Light shade to full sun, its colour tends to richer and darker when grown in light shade.
Propagation: Almost exclusively by seed. Plants are sometimes grafted onto column-shaped cacti. Cutting scions from a flourishing plant is almost a crime because the scions do not root easily.