Kroenleinia grusonii (ex. Echinocactus) | Mother-in-law's cushion / Golden barrel cactus
€7,95
🌱 Morphology
Globose cactus, slow-growing, generally solitary, although it may produce basal offsets with age. In adult specimens, it can reach approximately 1 m in height and 80 cm in diameter, gradually acquiring a somewhat more cylindrical shape. The body is deep green and features numerous deep ribs, generally more than 20 in adult specimens.
The areoles are densely arranged on the ribs and develop numerous yellow or golden spines. Each areole has several radial and central spines, the latter being more robust and longer, which can reach several centimeters. The dense coverage of golden spines is the trait that gives the plant its appearance as a large golden sphere and its common name, golden barrel.
🌍 Distribution, habitat, and family
Family Cactaceae. It is a species endemic to Mexico, with a natural distribution from Zacatecas to San Luis Potosí. It grows in dry scrub and semi-desert environments, on rocky slopes, where drainage is very rapid.
Its natural populations are found at approximately 1,400 to 1,900 m of altitude. This high altitude is relevant for its cultivation: although it lives in a warm and arid region, nighttime temperatures and winter episodes can be considerably lower than those corresponding to a strictly lowland cactus. The currently correct name is Kroenleinia grusonii; Echinocactus grusonii, the name by which it has been historically known, is its homotypic synonym.
❄️ Temperature
USDA Zone 8b–11b. It tolerates minimum temperatures of down to −10 ºC in dry specimens, according to cultivation observations made at Desert CITY. This resistance should be interpreted as an observed tolerance to a specific minimum temperature, and not as a direct equivalence between −10 ºC and USDA Zone 8b.
The high altitude of some natural populations helps explain why it is not an exclusively thermophilic cactus. In cultivation, cold resistance increases considerably when the plant is completely dry, well-acclimated, and protected from persistent humidity. The main winter risk is not only low temperature, but the combination of cold and a damp substrate.
☀️ Lighting
Indicative DLI PAR: 20–30 mol·m⁻²·day⁻¹. It is a cactus with high light requirements. Intense lighting promotes compact growth, well-defined ribs, and a dense, golden spine cover.
Young specimens should be gradually acclimated to direct sun. Once adapted, they can receive high radiation. During exceptional episodes of intense heat, especially in small pots, it may be advisable to provide some protection during central hours to avoid excessive overheating of the body.
💧 Growth cycle and watering
Winter dormancy. Its cycle is related to warm temperatures and seasonal rainfall, but the high altitude of its natural populations introduces a marked thermal amplitude between day and night. Growth is especially favorable during spring and summer, when temperatures allow for adequate root activity.
During the active period, it is recommended to provide abundant watering and let the substrate dry out completely before the next application. In autumn, watering should be progressively reduced, and during the winter, kept practically dry. It should not be watered during very low temperatures.
During extreme heat episodes, it may also temporarily slow down its activity. Under these circumstances, heat should not be interpreted as a signal to automatically increase watering: one must first check that there is active growth.
🌸 Flowering
Specimens need to reach considerable maturity before flowering (about 18 years). The flowers appear forming a ring in the upper part of the body, near the apex, and are yellow, with a campanulate to widely infundibuliform appearance.
Flowering occurs mainly during the warm months, approximately in summer. When cultivated in Spain, it can be expected, as a guideline, between June and September, depending on the age of the specimen, the accumulation of light hours, and spring temperatures.
🌿 Nutrition
During the active growth period, Desert CHOICE® Cactaceae is recommended, applied after watering. Before flowering, it can be supplemented with Desert CHOICE® Flowering. Fertilizing is not recommended during winter dormancy or when the plant is subjected to extreme temperatures.
This is an inimitable xerophyte grown in Madrid in a technological square pot and with the substrate activated with mycorrhizal fungi.
📏 The sizes of our basic collection xerophytes are as follows:
S -> 9cm x 9cm
M-> 14cm x 14 cm
L-> 16cm x 16 cm
Large pots for large specimens, with price variable depending on age and diameter
* As this is an online purchase, the appearance of the sent specimen may vary slightly from the product image. The measurements of the plant are specified in the photo description, but this may also vary slightly, because, it is a living being! Each of the Desert CITY plants has unique characteristics.
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