🌱 Morphology
  One of the “old timers”… Generally solitary cactus, although it can occasionally branch, with an initially globose stem that may become subglobose, ovoid, or slightly cylindrical with age. It reaches approximately 4–12 cm in diameter and has a grey-green epidermis.

It develops 13–21 ribs, relatively low and pronounced, with a characteristic groove or depression between the areoles. The areoles are elongated and woolly, measuring approximately 6–10 × 4–6 mm.

The spination is extraordinarily distinctive and variable. Each areole can produce numerous spines, approximately 15–40 radial spines measuring 2–6 cm and 4–20 central spines measuring 3–6 cm, although the distinction between radial and central spines can be indistinct. They are fine, flexible, recurved, and frequently twisted and intertwined, sometimes almost completely concealing the body.

The color of the spines ranges from white to pale yellow. Specimens with white spination resemble a head of grey hair, hence the specific epithet senilis, meaning “senile” or “elderly”.

🌍 Distribution, habitat and family
Family Cactaceae. It is endemic to central Chile, mainly the Coquimbo Region and areas of Valparaíso, especially the provinces of Choapa, Limarí and Elqui. It grows in arid and semi-arid environments in the Andean foothills, on rocky slopes, generally among the shrubs of the Mediterranean scrubland, which can provide some protection from extreme solar radiation.

Its altitudinal range reaches approximately 600–2000 m, according to available distribution records. The root is tuberosous, an important adaptation for storing reserves and making use of seasonal rainfall.

Taxonomically, for decades it was known as Neoporteria senilis Backeb.. 

❄️ Temperature
USDA zone 8b. Tolerates minimum temperatures of up to −9 ºC, as a specific reference for dry, well-acclimatized specimens protected from moisture.

 Lower tolerances have been documented in certain forms and conditions. Therefore, the figure of −9 ºC should be understood as occasional tolerance and not as a recommended growing temperature. The risk increases considerably when the cactus remains damp during cold spells.

☀️ Lighting
Indicative DLI: 18–25 mol·m⁻²·day⁻¹.

It requires high light levels to maintain compact and properly developed spination. It can be grown in full sun after gradual acclimatization, although in its habitat some populations grow partially protected by scrubland.

Intense radiation also promotes the formation of dense spines and the expression of white, yellowish, or reddish tones in the spination.

💧 Growth cycle and watering
Winter dormancy. It is a cactus with mainly summer growth, adapted to a Mediterranean climate with rainfall concentrated outside the warm season, but with a vegetative response that allows it to make use of favorable summer temperatures in cultivation.

During the active period, it is recommended to water abundantly and let the substrate dry out completely before watering again. Frequent and superficial watering should be avoided, especially because its tuberosous roots are sensitive to excess moisture.

As autumn arrives, watering should be gradually reduced. During winter, it is recommended to keep it practically dry, especially when temperatures are low.

In spring, watering should be gradually resumed as temperatures rise and signs of vegetative activity are observed.

🌸 Flowering
The flowers are one of the most striking features of Eriosyce senilis. They appear on young areoles near the apex, generally forming a crown of flowers around the upper part of the stem.

They are relatively large in proportion to the body, with an elongated and narrow floral tube, measuring approximately 2.5–5 cm in length, and a tubular to narrowly infundibuliform corolla.

The color can range from pink and magenta to intense carmine red, with a generally lighter throat. The floral tube has small scales whose axils are provided with tufts of white wool and some bristles, especially towards the upper part. The inner segments of the perianth remain partially curved inwards, giving the flower its elongated and elegant appearance.

In Chile, flowering occurs mainly during spring and summer, and the flowers stand out vividly against the spination, making the plants much more visible among the scrubland. In Spain, it can be expected approximately between May and August, depending on temperatures and the start of the active period.

🌿 Nutrition
During the active growth period, a fertilizer with a high content of assimilable calcium and low nitrogen levels is recommended, such as Desert CHOICE® Cactaceae, 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 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

* As this is an online purchase, the appearance of the specimen sent may vary slightly from the product image. The description on the photo specifies the plant's measurements, but these too may vary slightly, because it is a living thing! Each of the plants at Desert CITY has unique characteristics.