Kadenicarpus pseudomacrochele (Backeb.) Doweld

🌱 Morphology
  Small, generally solitary cactus, with a globose to globose-cylindrical body, light green to bluish-green, reaching approximately 2–4 cm in height and 2.5–3.5 cm in diameter. It develops a large, fleshy napiform root, adapted to store water and survive in very arid terrain. The apex is densely covered in white wool. The tubercles are low and rounded in the typical form, about 3–5 mm high, tapering gently toward the tip. It usually presents 5–8 spines that are yellowish or brownish, thin, flexible, twisted, and difficult to differentiate between radial and central; they can reach 1.5–3 cm in length and turn gray with age. Overall, the plant has a delicate, almost feathery appearance, which is very characteristic of Kadenicarpus.

🌍 Distribution, Habitat, and Family
It is endemic to northeastern Mexico, with populations in the states of Hidalgo and Querétaro, especially associated with the Mezquital Valley region. It grows at an altitude of approximately 1600 to 2000 m, on limestone rock outcrops and extremely well-draining mineral soils, generally in xerophilous scrubland and arid zones where it remains partially protected among stones and small crevices. Its distribution is very restricted, and populations are fragmented. It belongs to the family Cactaceae, subfamily Cactoideae, tribe Cacteae.

The species was originally described as Strombocactus pseudomacrochele in 1935 and subsequently moved through several genera. In Joël Lodé's classification, Kadenicarpus is maintained as an independent genus, and K. pseudomacrochele is part of it.

❄️ Temperature · USDA Zone 8b
It tolerates minimum temperatures down to −7 ºC when dry and with well-acclimated specimens. Due to its origin in the mountainous areas of north-central Mexico, it can withstand frosts, but it must be kept completely dry during the cold period.

☀️ Lighting
It requires plenty of light and direct sun to maintain its small size, keep the tubercles well-defined, and develop compact spination. Insufficient lighting can cause more elongated growth and lower density of wool and spines. As a guideline during active growth, a DLI PAR of 20–30 mol·m⁻²·day⁻¹ is recommended.

💧 Growth Cycle and Watering
Winter dormancy. During the cold period, it must be kept completely dry. In spring and summer, watering can be resumed when temperatures are high enough, providing abundant but spaced waterings and allowing the substrate to dry out completely before the next watering. The large napiform root stores water, so it tolerates drought better than frequent watering. Drainage must be excellent.

🌸 Flowering
The flowers are born in the apical area and are relatively large in relation to the small size of the body, reaching approximately 2.5–3.2 cm in length and up to 3–3.5 cm in diameter. In the typical subspecies, they are generally white to pale pink or purplish pink, with a more intense central band in some specimens. The flowers can also display magenta tones and strongly contrast with the white wool of the apex. The fruits are small, almost globose, approximately 4–6 mm, initially green and subsequently darker as they ripen.

🌿 Nutrition
During the active growth period, a fertilizer with a high content of assimilable calcium and low nitrogen levels, such as Desert CHOICE® Cactaceae, is recommended, applied once a month when watering. Before flowering, it can be supplemented with Desert CHOICE® Flowering.

This is an inimitable xerophyte grown in Madrid in a high-tech square pot, with the substrate activated with mycorrhizal fungi and biofungicides.

7x7 cm pot