Ferocactus cylindraceus (Engelm.) Orcutt was published under that combination in 1898, building on the earlier diagnosis by George Engelmann from boundary-survey collections of the mid 19th century and on Charles Russell Orcutt's reassessment in his California cactus papers. The species is native to the southwestern United States and northwestern Mexico, across southern California, southern Nevada, southwestern Utah, western Arizona, and northern Baja California. It grows on rocky bajadas, gravelly fans, and granite or limestone slopes between roughly 60 and 1,500 m elevation, sitting across both the Mojave and the Sonoran deserts. Each areole carries four straight central spines, and that single trait is the cleanest field separator from its more famous fishhook neighbour Ferocactus wislizeni.
In habitat, F. cylindraceus is part of the slow architecture of Mojave creosote scrub and the lower Sonoran wash communities. Plants share ground with creosote bush, ocotillo, and various chollas at lower elevations, and grade into Joshua tree woodland along the upper edge of the range. A typical adult reaches 1 to 3 m tall and 30 to 60 cm across, on the same 30 to 50 year timescale that F. wislizeni needs to reach mature size. Solitary plants are the rule; small clumps appear after damage to the original growing point, but the species rarely forms the dense colonies seen in some smaller barrels. International trade is regulated under CITES Appendix II, which covers the entire family Cactaceae, so any plant moving between countries needs the appropriate export documentation. State law in California, Nevada, Arizona, and Utah further restricts wild collection without permit.
Part of the Complete Cactus Guide.
Identification
F. cylindraceus begins life as a low globose plant and elongates with age into the cylindrical adult that gives the species its name. Mature stems usually run 18 to 30 ribs, vertical from base to crown, sometimes with a slight spiral twist on old plants. The body is medium green, partly veiled by spines on a well-grown specimen.
Each areole carries roughly 12 to 20 slender radial spines and four heavier central spines. The four centrals are straight; they do not hook. That detail is the field separator from F. wislizeni, where the lower central is bent into a clear fishhook at the tip. On F. cylindraceus, the lower central may flatten or twist a little, but it does not curl back. Spine colour is variable across the range: yellow on classic Mojave plants, pink to red on younger growth in southern California, and brown on weathered Sonoran specimens. The colour can shift down a single rib as new areoles harden, so judge spine colour from the freshest growth at the crown.
Flowering runs from late spring through midsummer, ahead of and partly overlapping the monsoon flowering of F. wislizeni. Petals are yellow, sometimes flushed with orange near the base, and individual blooms are 4 to 6 cm across, smaller and paler than the deep orange-red of F. wislizeni. Fruits are yellow, fleshy, and persist in a crown ring for weeks after the petals drop.
Mature plants of F. cylindraceus sometimes lean toward the south or southwest, which is why the species shares the common name "compass barrel" with several relatives. The lean is less pronounced and far less reliable here than in F. wislizeni; plenty of large F. cylindraceus stand upright their whole life. If you are using lean as a field cue, treat it as supporting evidence, not a primary trait.
Lookalikes. F. wislizeni overlaps with F. cylindraceus across western Arizona and shares overall stature, but the hooked lower central spine on F. wislizeni is decisive. If the central is straight, you have F. cylindraceus; if it hooks back at the tip, F. wislizeni. Ferocactus acanthodes is a name still printed on labels in nurseries and on older field guides, but most current treatments fold it into F. cylindraceus as a synonym, sometimes preserved as the subspecies subsp. lecontei or subsp. tortulispinus within the broader species. If you have an "F. acanthodes" tag on a Californian plant, you have the same taxon under a retired name. Echinocactus grusonii, the golden barrel of central Mexico, lacks heavy central spines, carries denser uniform golden radials, and stays a broad globe rather than elongating; it also tops out around 60 to 90 cm wide rather than reaching the columnar 2 m of F. cylindraceus.
Cultivation
Light. Give F. cylindraceus the strongest light you can manage. Outdoors in mediterranean and warm temperate climates, full sun is appropriate after a 10 to 14 day acclimation. Indoors, a south-facing window with the plant within 30 cm of the glass is the practical floor; weaker light produces pale, narrowed new growth at the crown that will not later thicken to match the older stem. The species tolerates direct desert sun once hardened, but a winter-housed plant moved straight to summer noon sun can scald on the exposed flank within a single afternoon.
Water. From spring through early autumn, soak the substrate thoroughly, then wait until the mix has dried through most of the pot before the next watering. In a 20 cm terracotta pot with a 12 to 15 cm plant, that interval is usually 18 to 25 days in warm dry weather, slightly longer than for F. wislizeni because F. cylindraceus draws on a drier habitat range and keeps growing well at lower watering frequency. A moisture probe should read below 15% in the upper 3 cm and close to dry at depth before you water again. Mild rib contraction between waterings is normal and not a distress signal. From late autumn through early spring, when temperatures are below about 12°C and light is low, hold water entirely if the plant is at a cool dry rest.
Substrate. Use a strongly mineral mix, roughly 75 to 85% mineral material to 15 to 25% low-peat or peat-free organic matter. A workable recipe is 40% pumice, 25% coarse grit at 3 to 6 mm, 15% lava or crushed granite, and 20% loam-based compost. Habitat soils are gravelly granite, decomposed limestone, or alluvial wash sand that drains within minutes of summer rain; a peat-heavy nursery compost held in a deep plastic pot is the opposite of that environment, and is the most common cause of root rot in cultivated plants of this species.
Temperature. Active growth runs from about 18 to 35°C, with strong tolerance for desert heat once the root system is healthy. Cold tolerance is genuine but conditional. Dry-rooted F. cylindraceus survives brief exposure to around -10°C in habitat, where winter nights at the upper edge of the range drop below freezing on a regular basis. In cultivation, that figure only applies if the substrate is dry, the plant is mature, and the cold spell is short. Wet roots at 2°C are far more dangerous than a dry light frost, and the same caution applies here as it does to F. wislizeni.
Pot. Mature plants become heavy and top-loaded, so stability matters as much as drainage. A wide, shallow terracotta pot is usually safer than a tall narrow plastic one for plants over 25 cm across. Repot only when the root mass has filled the container or the plant has become unstable, typically every 4 to 6 years for established specimens. Move plants with foam blocks, a folded carpet sling, or a cinched strap, never by gripping the spines.
Propagation
Seed is the only routine method for this species. Fresh seed germinates well on a sterile fine mineral surface at 24 to 28°C, with bright filtered light and a covered tray to hold humidity. Expect emergence in 10 to 21 days from viable seed, with a realistic germination rate of 50 to 75% from cultivated stock. Seedlings are slow: a year-old plant may be 5 to 8 mm across, and saleable size around 4 to 6 cm represents three to five growing seasons of careful work. Algae and fungus gnats kill more F. cylindraceus seedlings than any other factor, so increase ventilation from the second month onward and keep the surface lean and mineral.
Vegetative propagation is rarely useful. The species is normally solitary, and the basal pups that occasionally form after damage are slow to root and not worth removing from a strong parent.
Notes
Conservation and trade. F. cylindraceus is widespread and not currently considered globally threatened, but every plant moving across an international border still falls under CITES Appendix II reporting. Domestic protection in California, Nevada, Arizona, and Utah further restricts wild collection without permit. Nursery-grown seedlings are widely available, root more reliably than field-dug adults, and avoid the legal and ethical weight that comes with habitat-collected plants. Old wild barrels cannot be replaced in a human lifetime.
The acanthodes question. Older books and a fair number of garden centre labels still sell this species as F. acanthodes. Most current treatments place that name as a synonym of F. cylindraceus, sometimes preserved as a subspecies within the broader taxon. If you buy from a labelled nursery and the tag reads F. acanthodes, the care does not change.
Pests and handling. Scale insects and root mealybug are the routine cultivation pests, often hidden among radials or under the soil line. Inspect new arrivals with a hand lens before placing them near established plants, and check the inner pot wall and root crown when repotting. Although F. cylindraceus does not carry hooked centrals, its straight centrals still run 4 to 8 cm long, are rigid, and puncture skin easily; handle with a folded carpet strap or foam blocks rather than gloves alone.
See also
- The Complete Cactus Guide, the broader cultivation guide covering ribs, areoles, mineral substrate, light, and winter rest.
- Ferocactus wislizeni, the fishhook barrel, the closest sibling and the species F. cylindraceus is most often confused with in the field.
- Echinocactus grusonii, the golden barrel of central Mexico, useful for comparing rib structure, spine arrangement, and adult proportions.
- A Beginner's Guide to Succulents, broader context for matching succulent plants to light, soil, and seasonal water.