Astrophytum caput-medusae is an unusual cactus with cylindrical and very reduced stem. The tubercles are cylindrical or occasionally triangular when young, similar in aspect to leaves and up to 7.6 inches (19 cm) long. The flowers are diurnal, yellow with the base of the inner perianth-segments orange colored.
The Astrophytum is a cactus and the adequate soil must be one with good drainage. Combine cactus mix with another element that allows drainage, for example, perlite, sand, pumice, granite stone, or vermiculite. If you do not find the cactus mix, you may opt to use cacti mix soil. The Astrophytum cactus is prone to bacteria and fungus, to avoid this, it is necessary that you sterilize the soil before planting. Also, it is important to highlight that you must remove any particle from the substrate, and you can do this to avoid the formation of fungus. Proceed to fill the pot and moist the substrate, but do not add so much water because the Astrophytums don’t tolerate over-watering. Once the soil is moist, put the seeds in a gently way over the substrate, you do not need to bury them.
Cover the pot with a glass sheet, a white paper or something that maintains the humidity in both the container and the seeds some people, prefer to use a plastic bag and wrap the pot with it. Keep the flowerpot or the seed tray in a light shadowy place, provide the necessary temperature (heat math).
Once the seedlings appear, is time to let them get accustomed to the sun, start putting the seedling a few minutes every day and increase the time to the sun progressively. Remove the weak plants because they are the most prone to contract pests and diseases.
- Young seedlings seem to need some light watering in winter, no damages or rot has been evidenced for plants watered in winter. - They prefer a shaded or semi-shaded position as they live in habitat under shrubs. - All the few plant under observation stopped to grow at the end of August, beginning a complete winter dormancy. The first sign of new growth appeared only on the month of march. - The plant are quite resistant to frost (during winter the green house temperatures varied from a minimum of 0° C at night to a maximum of 25° C during sunny days) no sign of damage has been signalized.