Synonyms:

Sulcorebutia mairanana is classified as a nomen nudum, an unverified designation, noted in Karel Kníže’s catalog under field number KK1811. This enigmatic categorization is attributed to a specimen sourced from Mairana, Bolivia. However, the identity of this plant is debated and likely corresponds to Sulcorebutia albissima, recognized as a white-spined variation of Rebutia mentosa.

Habitat:

Native to Bolivia, Sulcorebutia mairanana is exclusively found in the region of Cochabamba, flourishing within altitudes spanning from 2100 to 2900 meters. In its native surroundings, this cactus demonstrates a strong affinity for rocky slopes and crevices.

Description:

Sulcorebutia mairanana, also referred to as S. mairanana, stands out as a unique regional variation within the diverse spectrum of Rebutia mentosa. This cactus showcases compact clustering stems and captivating deep purple blooms. It’s worth noting that there are similar forms and variations across different locations that closely resemble this specific variant. Initially described as a solitary plant, Sulcorebutia mairanana tends to form clusters in cultivation, gradually creating an appealing patchwork effect over time. The stems of this species exhibit diverse shapes, ranging from globular to flattened or slightly elongated-cylindrical forms, with a diameter reaching up to 6 cm. The radial spines are distinguished by their off-white, greyish, or light brown tones. They are arranged in a pectinate manner, lying flat against the surface and elegantly interweaving. These needle-like spines possess a sturdy yet slightly curved structure, presenting an aesthetically pleasing arrangement, particularly in well-developed specimens. Central spines are generally absent in Sulcorebutia mairanana, further contributing to its distinctive characteristics. The flowering pattern of this cactus is quite remarkable. Several large, intensely hued glossy dark pink to purple-red flowers emerge from the base, adding a vivid burst of color. As is common among sulcorebutias, the blooming season coincides with spring, showcasing the plant’s vibrant blossoms during this time of the year.

Cultivation:

Sulcorebutia mairanana is a type of cactus that flourishes during the summer months, making it easy to care for. It stands out for its higher tolerance to cold compared to most cacti. These plants hail from mountainous regions and possess robust taproots, making them prone to damage from excess water. Ensuring proper air circulation is crucial, and in some cases, grafting may be done to prevent root issues. Under optimal conditions, Sulcorebutia mairanana exhibits relatively swift growth and readily produces flowers. With time, it forms clumps of interconnected plants. This cactus thrives in a coarse mineral cactus mix soil. However, it’s important to avoid overly nutrient-rich compost, which can cause the plant to elongate excessively. When repotting, opt for pots with efficient drainage systems to prevent water buildup. During spring and autumn, provide moderate watering. However, be cautious not to overwater, as excessive moisture can lead to rot. In the winter dormant period, it’s vital to keep the plant entirely dry due to its sensitivity to excess moisture. In the summer, feed with a high-potassium fertilizer to support healthy growth. During the winter rest period, it’s advisable to keep the plant in a cool environment. By maintaining a dry state prior to and during cold weather, you can enhance its resistance to frost. The plant can endure temperatures as low as -7°C, or even lower for brief periods. This cold exposure is essential for both flower formation and overall plant health. Sulcorebutia mairanana thrives when exposed to full sun or light shade. Careful watering promotes compact growth and vibrant spine coloration. Intense sunlight may lead to the plant taking on a bronzed appearance, encouraging robust flowering and spine production. In extremely hot summer days, providing some light shade can be beneficial. This cactus is an excellent choice for container gardening. It retains a visually appealing look while remaining compact in size. It also complements cold greenhouses, frames, or outdoor rockeries. While it may attract various insects, healthy plants grown in mineral potting mix with proper exposure and ventilation tend to be resistant to pests. Keep an eye out for potential issues such as red spiders, mealy bugs, Sciara flies, and scales. Applying a systemic insecticide twice a year in spring and autumn is a recommended practice. Proper watering and adequate aeration are crucial for preventing rot. To further minimize the risk, it’s wise to surround the root neck with coarse sand or grit, enhancing water drainage.

Propagation:

There are various methods for propagating Sulcorebutia mairanana, including using seeds, cuttings, and grafting techniques. When starting from seeds, they typically sprout within a span of 7 to 14 days, under temperatures ranging from 21 to 27°C during the spring season. As the plants establish their roots, which usually takes around 1 to 2 weeks, it’s advisable to gradually remove the glass cover. During this phase, proper ventilation is essential. However, it’s important to shield young plants from direct sunlight, as they are sensitive to its intensity and can benefit from some shading.

Curiosity:

Sulcorebutia mairanana knows well how to work well with others. It can be grafted onto different rootstock to enhance its growth and overall resilience. The identity of Sulcorebutia mairanana wasn’t always crystal clear. Its classification as a nomen nudum sparked debates, but it’s believed to correspond to the enchanting Sulcorebutia albissima, a striking white-spined variation.

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