Synonyms:

This particular cultivar does not have widely recognized synonyms but is often referred to simply as ‘Koh-yo’ among cactus enthusiasts and collectors. It belongs to the broader category of Astrophytum myriostigma, commonly known as the Bishop’s Cap Cactus. Sometimes the plant is also called Echinocactus myriostigma.

Habitat:

The species Astrophytum myriostigma originates from the arid and semi-arid regions of Northern and Central Mexico. These habitats are characterized by rocky and sandy soils with minimal organic content, under full sun exposure. The ‘Koh-yo’ cultivar, being a cultivated variety, thrives under similar conditions that mimic the natural environment of its species well-draining soils, low humidity, and high light levels.

Description:

The ‘Koh-yo’ cultivar of Astrophytum myriostigma is a cactus belonging to the Cactaceae botanical family and is distinguished by its unique appearance. The unique characteristic of this particular specimen is its variegation – it exhibits a combination of green and red-orange hues. This variegation is not uniform but rather appears as sectors or patches, creating a stark contrast on each of the plant’s segments. The cactus has a globular shape with distinct ribbing, which is typical of the Astrophytum genus. Each rib appears to be slightly curved inward, giving the plant a star-like shape when viewed from above. The cactus’s surface is smooth, lacking the areoles and spines that are common in many other cacti, which contributes to its sleek appearance. The apex of each rib is accentuated with a brighter orange or red coloration, further highlighting the star-like pattern. This Astrophytum cultivar is relatively small and compact, making it an ideal choice for cultivation in pots and as a part of a succulent collection. The plant is shown in various images, each highlighting the vibrant coloration and symmetrical form that make this cactus a visually striking specimen. The potting mix looks well-draining, with components like pumice or perlite visible, indicating appropriate care for cactus cultivation to prevent water retention and root rot.

Cultivation:

Cultivating Astrophytum myriostigma cv. ‘Koh-yo’ requires conditions that allow for plenty of sunlight and minimal water, mimicking its native habitat. A well-draining soil mix, specifically designed for cacti, is essential to prevent root rot. This cultivar does well in pots, which allows for better control over watering and drainage. It prefers full sun but may require some shade in the hottest part of the day to prevent sunburn, especially in younger plants or in very hot climates. Watering should be regular but sparse, allowing the soil to dry completely between waterings. During the winter months, watering should be reduced significantly to a bare minimum, as the plant enters a period of dormancy. ‘Koh-yo’ is not frost-tolerant, so it should be protected from temperatures below freezing.

Propagation:

Propagation of the ‘Koh-yo’ cultivar is typically done through seeds, as it is a specific variety that may not reproduce true to type through offsets, which are rarely produced by this cultivar. Seeds can be sown in a well-draining cactus mix, covered lightly, and kept at a warm temperature with indirect light. Germination can take several weeks, and young seedlings are sensitive to overwatering. Care should be taken to ensure that they are kept in a controlled environment to protect them from extremes of temperature and moisture.

Curiosity:

The Astrophytum myriostigma cv. ‘Koh-yo’ is highly prized among cactus collectors for its decorative appearance, which is enhanced by the dense white areoles giving it a snow-capped look. This cultivar’s name, ‘Koh-yo’, translates to ‘red sun’ in Japanese, a poetic nod to its beautiful yellow flowers that contrast vividly against its white and green body. The cultivar showcases the incredible variety that can be achieved through selective breeding in cacti, making it a fascinating subject for study and collection. Its care requirements and striking appearance make it a rewarding challenge for cactus enthusiasts, offering a blend of aesthetic beauty and horticultural intrigue.

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