Dense ribs and interesting spines.

Echinofossulocactus phyllanthus "Grandicornis" SB437: The Majestic Horned Cactus

1. Origin of Name:

The genus "Echinofossulocactus" combines Greek and Latin roots—"echino," meaning "spiny," "fossula," meaning "little ditch" or "furrow," and "cactus," indicating its family. The species "phyllanthus" refers to its leaf-like or flattened spines, resembling tiny leaves, with "grandicornis" deriving from Latin—"grandis," meaning "large," and "cornu," meaning "horn." This variety's name alludes to its prominent, horn-like spines or tubercles, which give it an imposing, regal appearance. The SB437 refers to a specific collection or specimen number, often used by botanical collectors or breeders.

2. Origin of Plant:

This species is native to the arid regions of Mexico, particularly in rocky mountains and desert slopes where it has adapted to extreme heat and drought. Its natural habitat features well-drained, stony soils, often in secluded or rugged terrains. Its horned, spiny morphology has fascinated botanists and collectors alike, especially in cultivated forms such as "Grandicornis."

3. Description:

Echinofossulocactus phyllanthus "Grandicornis" SB437 is a striking, globular or cylindrical cactus that can reach 4-8 inches in height and diameter. Its surface is covered with raised, furrowed tubercles, each adorned with long, curved, horn-like spines—creating a dramatic, regal silhouette. The spines are usually a pale or darker hue, sometimes with a reddish tinge, adding to its majestic appearance. During the flowering season, it produces vibrant, funnel-shaped flowers in shades of yellow, pink, or red at the top or along the ribs, providing a stunning floral display amid its horned, ornate form.

4. Conservation Status:

While not critically endangered, wild populations of this species are susceptible to habitat disturbance and over-collection. Responsible cultivation through propagation supports conservation efforts and helps preserve this spectacular, horned cactus in cultivation, reducing pressure on wild populations.

5. Care:

To cultivate Echinofossulocactus phyllanthus "Grandicornis" SB437:

• Watering: Water sparingly, allowing the soil to dry completely between waterings, especially during winter dormancy.
• Soil: Use a well-draining cactus or mineral-based soil mix with added coarse sand, pumice, or gravel.
• Light: Requires full sun or very bright, direct sunlight for at least 4-6 hours daily to develop its horned spines and promote flowering.
• Temperature: Prefers warm conditions between 60°F (15°C) and 85°F (29°C). Protect from frost—bring indoors or insulate when temperatures drop in colder climates.
• Tips: Fertilize lightly during active growth with a cactus fertilizer. Keep an eye out for pests such as scale or mealybugs, which can be common.

Echinofossulocactus phyllanthus "Grandicornis" SB437 stands out for its majestic, horned spines and regal silhouette. This dramatic cactus is a prized addition for collectors seeking a bold, sculptural specimen that embodies the wild, ornate beauty of desert flora, making it an impressive centerpiece in any cactus or succulent collection.