Synonyms:

No synonyms are recorded.

Habitat:

Echinocereus triglochidiatus var. mojavensis f. inermis is native to the southwestern United States, ranging from Southern California to Colorado, and including southern Nevada, southwestern Utah, northwestern Arizona, as well as northeastern Baja California in Mexico. It primarily inhabits the Mojave Desert and chaparral environments, where it grows on dry, well-drained gravelly or rocky soils.

Description:

The genus name Echinocereus derives from the Greek echînos (“hedgehog”), referring to the spines, and cereus, a Latin term used for columnar cacti. The specific epithet triglochidiatus alludes to the presence of spines grouped together, resembling small hooks. The name mojavensis indicates the area of origin of the variety, the Mojave Desert, while inermis, from Latin, means “unarmed” or “spineless” and describes the distinctive feature of this form, which has areoles that are almost or completely devoid of spines.

Echinocereus triglochidiatus var. mojavensis f. inermis belongs to the genus Echinocereus and to the family Cactaceae. It is the generally spineless form of the variety mojavensis, although some specimens may develop very short spines, resulting in partially spineless plants. The plant initially grows as a solitary individual but tends to offset with age, forming dense and sometimes very large clumps. The stems are erect, globose to cylindrical in shape, pale green to bluish green in color, and can reach a height of approximately 5 to 45 cm, while remaining relatively narrow in diameter. The ribs, variable in number, are low and slightly undulate, with weakly developed tubercles that tend to become less distinct with age. Whitish, slightly woolly areoles develop along the ribs, from which spines may be absent or extremely reduced; when present, they are thin and curved, initially light-colored and gradually turning grayish over time.

From late spring to early summer, the plant produces solitary, showy, diurnal flowers ranging in color from bright red to red-orange. The flowers have a waxy texture and a funnel-shaped form, emerge near the apex of the stems, and are typically 5-7 cm long. Once open, they remain so for several days, attracting insect pollinators and hummingbirds. A distinctive feature of this species is the way the flower buds are produced: rather than emerging from the areoles, they break through the stem epidermis above an areole, leaving a small scar after flowering. Approximately two months later, oblong, fleshy, and juicy fruits develop; they are green to yellow-green in color, turning reddish at maturity, and contain white pulp with numerous dark seeds.

Cultivation:

The plant grows slowly and is generally easy to cultivate.

It prefers a very well-drained substrate. The ideal growing medium is predominantly mineral, composed of coarse sand and inert materials, with a limited organic component. Good drainage is essential to prevent waterlogging, especially during the colder months. When grown in containers, it is important to use pots with drainage holes to allow excess water to drain quickly.

From March to October, the plant should be watered regularly, allowing the substrate to dry out completely between waterings. During autumn and winter, watering should be drastically reduced or suspended, particularly if the plant is kept in a cool environment.

It requires a bright exposure with intense light and several hours of direct sunlight. In insufficient light conditions, the plant tends to lose vigor and flower production is significantly reduced. It is a particularly cold-hardy species and can tolerate temperatures down to approximately -6 °C, provided the substrate is completely dry.

During the growing season, from spring to summer, a fertilizer specifically formulated for cacti, low in nitrogen and well balanced, may be applied at low doses. Fertilization should be suspended in autumn and winter.

Repotting should be carried out only when necessary, approximately every 2-3 years, preferably in early spring. The plant does not require excessively large containers, but rather pots proportionate to the root system, well-draining, and filled with fresh soil.

Echinocereus triglochidiatus var. mojavensis f. inermis is not considered toxic to humans or pets. In addition, the absence or strong reduction of spines makes this form particularly safe to handle compared to other cacti, reducing the risk of accidental injury.

When grown under appropriate conditions, this species shows good resistance to diseases and pest infestations. The most common issues are related to excessive substrate moisture, which can lead to root or basal stem rot. Among pests, mealybugs and aphids may occasionally appear, especially in container-grown plants or poorly ventilated environments.

Care tip: for abundant flowering, it is recommended to grow the plant in full sun, as reduced light conditions tend to result in fewer flowers.

Propagation:

This species can be propagated both by seed and by division of clumps. Sowing is carried out in spring, using a light, well-drained substrate kept slightly moist until germination. Division of offsets, the more reliable method, is performed during the growing season by carefully separating well-developed stems and allowing the cut surfaces to dry before planting. In both cases, it is important to avoid excess moisture during the initial stages and to be patient, as the plant has a relatively slow growth rate.

Curiosity:

In its natural habitat, specimens growing in narrow, sand-filled rock crevices – where space is limited and resources are scarce – tend to remain compact and develop few stems. By contrast, plants growing near rocks or under the partial shade of shrubs usually show more vigorous growth and a more robust overall structure.