Phoenix Desert Seeds

Astrophytum myriostigma var nudum seeds

Astrophytum myriostigma var. nudum – The Sculptural “Naked” Bishop’s Cap

Astrophytum myriostigma var. nudum, commonly called the Naked Bishop’s Cap, is a visually striking and botanically intriguing cactus prized for its smooth, unspotted skin and perfectly geometric structure. This variety is a natural mutation of the classic Astrophytum myriostigma, distinguished by its lack of the white, woolly trichomes that typically coat the plant. The result is a clean, glossy green surface that emphasizes its star-like symmetry, making it a favorite among collectors and succulent enthusiasts.

Native to the elevated deserts of Mexico, this cactus thrives in hot, dry climates where the sun is intense and rainfall is minimal. The species has evolved to withstand these arid conditions with a thick, water-retaining stem and slow but steady growth habits. In cultivation, A. myriostigma var. nudum grows as a solitary, ribbed column, usually with 5 prominent vertical ribs, though some specimens may display 4 or 6. Its spineless body gives it a sleek, architectural appearance that makes it highly decorative and ideal for minimalist displays, modern interiors, or as a striking element in outdoor rock gardens in warm climates.

One of the most appealing aspects of Astrophytum myriostigma var. nudum is its nearly flawless symmetry. The ribs gently taper to a point at the apex, forming a shape that resembles a bishop’s cap—hence its common name. The plant’s smooth skin allows light and shadow to dance across its surface, highlighting its structure in a way that woolly varieties do not. Over time, mature plants can reach 6–10 inches (15–25 cm) tall and up to 4–6 inches (10–15 cm) in diameter.

In late spring to summer, the plant produces large, lemon-yellow flowers with a satiny texture. These blooms emerge from the growing tip and may be followed by small, fuzzy fruits. The contrast of vibrant yellow against the deep green body makes flowering specimens particularly eye-catching. While the flowers are short-lived, they often appear in succession over the growing season, offering multiple displays of color.

Growing Astrophytum myriostigma var. nudum is relatively easy for both beginners and advanced growers. It prefers full sun but can tolerate bright filtered light, especially in extremely hot regions where afternoon shade may prevent sunburn. Soil must be very well-draining—ideally a cactus or mineral-based mix. Overwatering is the primary risk; like most desert cacti, it is highly susceptible to root rot in soggy soil. During its active growing season (spring through early fall), occasional deep waterings followed by complete drying out are ideal. In winter, the plant should be kept mostly dry to prevent cold damage.

This variety is best grown in containers unless you live in a frost-free climate. Because it is spineless and compact, it is an excellent candidate for indoor growing on sunny windowsills or in greenhouses. Its tidy appearance and low maintenance needs make it especially appealing for modern homes, plant stylists, and serious collectors alike.

Key Features

• A smooth-skinned, spineless cactus with striking architectural symmetry

• Naturally lacks the woolly spots typical of the species, giving it a “naked” look

• Produces large yellow flowers during warm seasons

• Grows slowly, forming compact, upright columns

• Perfect for minimalistic displays, rock gardens, and sunny interiors

• Requires very little maintenance and is drought tolerant

• Highly desirable among cactus collectors

Care Summary

• Light: Full sun to bright filtered light

• Water: Infrequent; allow soil to fully dry between waterings

• Soil: Gritty, fast-draining cactus or mineral-based mix

• Fertilizer: Occasional feeding during growing season with a cactus fertilizer

• Temperature: Protect from prolonged frost; ideal above 40°F (5°C)

• Growth Rate: Slow to moderate

Whether you’re expanding a rare cactus collection or looking for an elegant, sculptural centerpiece for your plant display, Astrophytum myriostigma var. nudum offers a distinctive form and effortless charm. Its spineless, clean appearance combined with minimal care needs make it a rewarding addition to any succulent lover’s garden.