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Astrophytum myriostigma var. nudum (Bishop's Cap)


Scientific Name

Astrophytum myriostigma var. nudum (Rud.Mey.) Frič

Common Names

Bishop's Cap Cactus, Bishop's Cap, Bishop's Hat, Bishop's Miter Cactus, Bishop's Hood


Astrophytum myriostigma subsp. nudum, Echinocactus myriostigma var. nudus

Scientific Classification

Family: Cactaceae
Subfamily: Cactoideae
Tribe: Cacteae
Genus: Astrophytum


Astrophytum myriostigma var. nudum is very similar to Astrophytum myriostigma, it only deviate from the well-known typical form for lacking or mostly lacking white flecks. The stem is spherical to shortly columnar with age, up to 3.3 feet (1 m) tall and up to 4 inches (10 cm) in diameter. The number of ribs vary from 3 to 8 (usually 5). Flowers are up to 2 inches (5 cm) long, pale-yellow and bloom in spring or early summer. It take up to 6 years to bloom.

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How to Grow and Care

Astrophytums are not vigorous plants and they require a lot of patience to reach their full potential. Keep regularly watering and feeding them during the growing season and repot annually to give them space to develop. They need a temperate, dry winter as well, and make sure not to overwater them to avoid rotting their roots. If given sufficient care, they will develop marvelous flowers once they reach maturity.

Repot regularly to help them develop. Astrophytums should be repotted at the beginning of the growing season for best results, allowing them to grow into the impressive specimens for which the genus is known. Protect your hands before repotting due to their stiff spikes and lift the plant out all at once, then replace in a larger pot and backfill with soil. Don't overwater or overfeed newly repotted cacti, as disturbances can be hard on them… – See more at: How to Grow and Care for Astrophytum.


Native to the highlands of northeastern and central Mexico.


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