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Astrophytum myriostigma (Onzuka)

Scientific Name:

Astrophytum myriostigma (Onzuka)

Common name:











Hardiness Zone:



ABout the PLant

Astrophytum myriostigma, commonly known as Onzuka cactus, is a succulent native to the Chihuahuan Desert of Mexico. It is a popular choice for collectors and gardeners alike due to its unique appearance and easy care requirements. This small cactus grows in an unusual star-shaped form with five pointed ridges that radiate outward from the center. The ridges are covered in short white spines that give it a soft fuzzy look. Its leaves are thick and fleshy, growing up to 2 inches long and arranged in spirals around the stem. In springtime, Onzuka cactus produces bright yellow flowers with orange centers. These flowers bloom on top of the plant and attract pollinators such as bees and butterflies. Onzuka cactus is easy to care for and can be grown indoors or outdoors in containers or rock gardens. It prefers well-draining soil, full sun, and regular watering during the summer months. In winter, water should be reduced significantly to prevent root rot. The origin of Onzuka cactus is unknown but it has been cultivated by Japanese gardeners since at least 1868 when it was first described by botanist Tomitaro Makino in his book “Flora of Japan”. Today it remains a popular choice among succulent enthusiasts due to its low maintenance requirements and striking appearance.
Astrophytum myriostigma (Onzuka) succulents thrive in bright indirect light. This means that the plant should be placed in an area with lots of natural light, but not directly exposed to sunlight. If direct sunlight is unavoidable, it's best to provide some shade for the plant during the hottest part of the day. Additionally, Astrophytum myriostigma (Onzuka) succulents can tolerate medium and low light levels, but they won't grow as quickly or produce as many flowers in these conditions.
Astrophytum myriostigma (Onzuka) succulents prefer well-draining soil that is slightly acidic. The ideal soil should be light and airy, with a combination of sand, perlite, and potting mix. It's important to make sure the soil doesn't stay too wet or soggy as this can cause root rot. A good way to ensure the right balance is to water your Astrophytum myriostigma (Onzuka) when the top inch of soil has dried out.
The Astrophytum myriostigma (Onzuka) succulent is a low-maintenance plant that requires infrequent watering. During the summer months, it should be watered about once every two weeks, allowing the soil to dry out completely between waterings. In the winter months, you can reduce watering frequency to once every month or even less depending on your climate. Make sure to always check the soil before watering and never allow it to become soggy.
The ideal humidity conditions for the Astrophytum myriostigma (Onzuka) succulent is between 40-50%. This means that the air should not be too dry or too wet. The succulent will do best in an environment with moderate humidity, so it's important to keep the soil slightly moist but not soggy.