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The name Astrophytum derives from the Greek 'aster' (star) and 'phyton' (plant) and is assigned in relation to the star-like appearance that is formed by the numerous ribs of the species. Astrophytum myriostigma is a globose plant that can become columnar over time. One of the Astrophytums best known and appreciated by succulent plant lovers for its particular green epidermis, entirely covered with white dots that give it an almost silvery appearance. It can have from three to ten (most commonly five) well-marked ribs, with a well-defined border of white downy areolae, which over time take on a yellowish color. A. myriostigma generally grows on stony soils in elevations up to 1500 m above sea level. Accustomed to a mild climate, these cacti love sunny and even semi-shaded places (however, during the hottest hours of the day they are not left under the direct rays of the sun). This genus is very sensitive to cold and excessive humidity. The soil to be used must be well draining, mixed with pumice and lapillus to allow water to drain away, avoiding possible stagnation. If watered excessively or if the substrate is not adequate, the root rot to which this genus is subject can be created. During spring, large funnel-shaped, entirely yellow inflorescences grow at the apex of the plant. Easy-to-grow plant suitable for beginners.
Astrophytum myriostigma has numerous varieties such as:
To these varieties we can also add the crested, monstrous and variegated forms.
Common names: Bishop's hat.
Requires an exposure to full sun since it requires a lot of light all year around. When the plants are still very young, it is advisable to prottingect them from direct sun rays during the hottest hours of the day.
It is preferable to keep it at mild temperatures and never below 4 °C, for this reason it is recommended to shelter it during the winter period.
Water moderately only when the soil is completely dry. It is enough to water the plant once every two weeks in spring and summer, once every two months in autumn and suspend it completely in winter.
A well-draining and mineral-rich substrate is an optimal solution, for example a soil suitable for cacti, to which pumice can be added.
They do not need frequent fertilization, it is sufficient to dilute the fertilizer with watering once a year.