Astrophytum myriostigma Onzuka Quadricostatum

Astrophytum myriostigma Onzuka Quadricostatum

The Astrophytum myriostigma Onzuka Quadricostatum is a fascinating and rare cultivar of the Astrophytum myriostigma, commonly known as the Bishop’s Cap Cactus. This specific cultivar is prized for its unique appearance and distinct features. Here’s a detailed guide:

Key Features of Astrophytum myriostigma Onzuka Quadricostatum

• Shape: Astrophytum myriostigma Onzuka Quadricostatum variety typically has four ribs, unlike the usual five, giving it a symmetrical and sculptural look.
• Pattern: The “Onzuka” trait refers to the striking white speckled or marbled pattern across the green skin, giving it a frosted or starry appearance.
• Size: It remains compact and slow-growing, making it an excellent choice for collectors or small spaces.
• Spines: Like other myriostigmas, this cactus is spineless, adding to its sleek aesthetic.

Care Instructions

Light

• Astrophytum myriostigma Onzuka Quadricostatum prefers bright, indirect sunlight.
• Can tolerate some direct sunlight but avoid harsh afternoon sun, which may scorch the plant.
• Indoors, place near a sunny window or under grow lights.

Watering

• Water using the soak-and-dry method, ensuring the soil is completely dry before watering again.
• Reduce watering frequency during the winter dormancy period.
• Overwatering is the most common issue; it leads to root rot.

Soil

• The Astrophytum myriostigma Onzuka Quadricostatum Requires a well-draining cactus mix. Enhance drainage by adding perlite, pumice, or coarse sand.
• Avoid dense or water-retentive soil.

Temperature

• The Astrophytum myriostigma Onzuka Quadricostatum thrives in warm temperatures between 65°F and 85°F (18°C to 29°C).
• Protect from frost; temperatures below 50°F (10°C) can harm the plant.

Humidity

• Prefers low humidity. Ensure good air circulation to prevent fungal problems.

Fertilizer

• Feed with a diluted, balanced cactus fertilizer during the growing season (spring and summer).
• Fertilize monthly or every six weeks.

Pot and Repotting

• Use a pot with good drainage holes, such as terracotta.
• Repot every 2–3 years or when it outgrows its pot, typically in early spring.
• Be gentle with the roots during repotting, as they are delicate.

Propagation

• Propagation is challenging due to its slow growth but possible through seeds.
• Ensure seeds are sown in a sterile, well-draining medium with consistent warmth and humidity.

Special Notes

• Collectors’ Item: The Astrophytum myriostigma Onzuka Quadricostatum is highly sought after due to its rarity and stunning appearance.
• Growth Rate: It is slow-growing, so patience is essential.
• Toxicity: Non-toxic to pets and humans.

The Onzuka cultivar is a highly sought-after and unique variant within the Astrophytum genus, specifically found in species like Astrophytum myriostigma. This cultivar is named after the distinct, heavily marbled or speckled white patterning on its body, which sets it apart from other varieties.

Collector’s Notes

• Rarity: The Onzuka cultivar is popular among cactus enthusiasts and collectors due to its aesthetic appeal and rarity.