Growing and Caring for Astrophytum Myriostigma


Astrophytum myriostigma (ass-tro-FY-tum MEE-ree-oh-STIG-mah) is a blooming spineless cactus species in the Cactaceae family and genus Astrophytum. It’s worth noting that the term Astrophytum comes from the Greek word astron, which means “star plant.”

Astrophytum Myriostigma Bishop Cap Cactus PinFlowers The lovely succulent Astrophytum Myriostigma, like other plants in this genus, grows in the shape of a star.

Bishop’s Cap Cactus Care Instructions

Astrophytum myriostigma (Botanical Name)
Bishop’s Cap Cactus, Star Cactus, Bishop’s Miter Cactus, Bishop’s Hat Cactus
Cactaceae family, genus Astrophytum | Mexico
Growability: Easy
Grow USDA hardiness zones 10–11
Size: mature 23′′-39′′ height, ” inches around
Flowering time: Spring or early summer, yellow with a crimson or orange core.
Never expose yourself to direct sunlight.
Temperature range: 50°-68° Fahrenheit
Water: Low water requirements
Fertilizer: A diluted liquid fertilizer with a low nitrogen concentration.
Pests and Diseases: Mealybug, Plant Scale, Overwatering Rot
Propagation: Seeds
Grooming: None
Uses Excellent houseplant and window sill plants.

It is known as Echinocactus myriostigma, as well as numerous other common names:

  • The Star Cactus
  • Bishop’s Hood,
  • Bishop’s Cap,
  • Bishop’s Miter cactus
  • The Bishop’s Hat
  • Cactus Deacons Hat Miter
  • The Monk’s Hood

Bishop’s Cap is endemic to northern and central Mexico’s highlands, where it thrives on rocky, calcareous soil.

In the mid-nineteenth century, Cactus Astrophytum was imported into Europe.

The Bishop’s Hat grows at an elevation of 2500′ – 5000′ feet above sea level in its native environment and is suitable for USDA hardiness zones 10-11.

Size and Growth of Bishop’s Cap Cactus (Astrophytum)

Young Bishop’s cap plants have a globe-like appearance and are more or less spherical in shape. As the plant grows higher, the white hairy scales resemble a bishop’s mitre, the traditional head-dress used by bishops.

Adult Bishop’s Cap plants are often star-shaped, with 5 projecting ribs that have white dots or spots. Keep in mind, though, that the number of ribs might vary.

The star plant can have as little as three ribs or as many as ten ribs in exceptional circumstances! A mature Astrophytum Myriostigma stem can reach heights of 23′′ – 39′′ inches and a diameter of 8′′ inches.

Bishop’s Cap has a sluggish growth rate and takes its time to mature and produce blossoms.

Fragrance and Flowering

While the foliage is lovely on its own, the yellow blossom only adds to Astrophytum Myriostigma’s allure. The daisy-like blossom appears at the top of a mature plant and is often little more than 2′′ in diameter.

Each flower blooms for around two days. The blooms, on the other hand, bloom in succession, thus the blossoming season might stretch for months. The blooms are yellow with a scarlet or orange center and bloom in the spring or early summer. Despite their modest development pace, immature plants can rapidly blossom. These blooms have a light aroma that lingers.

Temperature and light

Astrophytum myriostigma appreciates sunshine and warmth.

Young plants, on the other hand, cannot tolerate direct sunshine. Plants thrive in mild shade and should never be planted in direct sunlight. Keep in mind that these plants require relaxation throughout the winter. As the temperature decreases toward the end of the year, keep it below 50° Fahrenheit to allow the plant to rest throughout the winter.

Feeding and watering

Astrophytum plants require little water. Water them sparingly throughout the winter months, from October to March. Start watering sparingly in March. As temps climb, gradually increase watering. Keep in mind that while Astrophytum Myriostigma requires just a modest quantity of water throughout the summer, it is critical that the plant not be overwatered. These plants, like water, do not require a lot of feeding. It a diluted liquid low nitrogen concentration fertilizer once a month during the summer and then discontinue use as winter approaches.

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Soil and Planting

Astrophytum Myriostigma is a rocky terrain native that thrives best in cactus soil or a mixture of 25% coarse sand, 25% pumice, and 50% potting soil. Spread a layer of sand over the surface of the dirt in the container to protect the plant’s neck.

Plant Astrophytum Myriostigma in tiny pots due to the limited root zone. If repotting is necessary, wait until early spring before transplanting these plants.

Maintenance and Grooming

Bishop’s Cap plants are modest (ideal for a window sill), but they are self-sufficient in terms of grooming and upkeep. There isn’t much to do but admire the plant. As a result, Astrophytum species are among the simplest to cultivate and maintain.

Astrophytum Myriostigma Propagation

Astrophytum plants are best propagated from seeds. Use a well-drained, sandy propagation soil. Press the seeds lightly into the soil. Maintain the soil’s temperature at roughly 78°F while keeping it gently wet. Move the Bishop’s Cap seeds to separate pots as they germinate and develop.

The best soil for young plants is a combination of:

  • a quarter of gritty sand
  • a quarter of a percent pumice
  • fifty percent potting soil

Also, don’t forget to sprinkle a thin layer of sand over the soil’s surface!

Keep in mind that although it is best to supply as much light as possible to early plants. Keep them away from intense sunshine and extreme heat, since they are still too sensitive to tolerate these circumstances.

Astrophytum Bishops Cap Pests and Diseases

As long as they are kept cold over the winter, these plants are immune to most houseplant pests. Mealybugs and scale insects might damage the plant if it is kept at warmer temperatures during the colder months.

When an attack occurs, use a toothpick to remove the insects and a piece of cotton dipped in alcohol to treat the afflicted regions. Brown spots at the base of elder plants are also typical. If similar spots form in younger plants, this indicates that the soil is overly damp.

The best method is to cease watering the plant. Place the pot in a tray of water as necessary. Allow the plant to absorb all of the water it needs in around 30 minutes. Also, add a small layer of sand to the soil to keep the plant’s neck dry.


Astrophytum myriostigma is an ideal home plant due to its modest size and sluggish development. The stunning yellow flowers are the icing on the cake, providing an ideal way to add a splash of color to any home.

Because the Bishop’s Cap prefers light and warmth, it is best placed near windows or on windowsills. It is one of the simplest succulent cacti to care for and is often suggested for beginning gardeners.

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