Agave salmiana var. ferox

Natural range of Agave salmiana var. ferox

Agave salmiana var. ferox is native to central Mexico, with a range extending from north-western Oaxaca toward eastern Veracruz. The older name Agave ferox is still widely used in horticulture.

The variety has a long history of cultivation in Mexico and is often grown around farms and settlements. Wild populations occur in dry upland landscapes.

Growing Agave salmiana var. ferox in a pot

• Space and handling: This becomes a very large plant. Move to a larger container when roots fill the pot and need more space. If drainage slows first, replace the old mix with fresh fast-draining mix; if the plant becomes unstable, use a broad, heavy container. Leave enough room to work safely around the hooked teeth.
• Water: Water thoroughly once the mix is dry throughout. Large containers can stay damp deep inside, so check below the surface before watering.
• Potting mix: Use a coarse, fast-draining succulent mix with plenty of pumice, lava or grit.
• Light: Give it full, bright light with direct sun. If the plant has been growing in softer light, introduce stronger sun gradually.
• Temperature: Aim for 10–30 °C, keeping the plant clear of prolonged chilling below 1 °C. Protect potted plants from freezing conditions and keep the mix drier in cool weather.
• Airflow: Normal indoor humidity is fine. Leave generous space around the large leaf bases so they dry after watering.
• Feeding: Feed lightly with a low-nitrogen fertiliser as the large rosette adds new leaves.
• Propagation: Separate a rooted offset, or grow it from seed.

Problems with Agave salmiana var. ferox

• Outer leaves collapse and the base feels soft: The large root system may have stayed wet for too long, allowing root or crown rot to develop. Cut rotten tissue back to firm, healthy tissue with a clean tool, discard the rotten material and wet mix, then repot the remaining healthy plant in fresh, coarse substrate.
• Brown shell-like bumps or sticky residue appear along the broad leaves: Scale insects may be feeding on the plant. Isolate it, remove visible scale and use a product labelled for the pest. Repeat treatment at the interval stated on the label.
• New leaves become narrow and lean outward: The large upright rosette needs stronger light. Move it to a brighter position so later leaves grow firmer and more upright.
• Dry pale areas develop after relocation: A rapid rise in sun intensity can scorch leaves formed in softer light. Move the plant out of the strongest sun and reintroduce direct sun gradually.

Agave salmiana var. ferox is toxic to people and pets

• Keep this plant away from children, cats and dogs, and handle the sharp leaves carefully.
• Its sap and tissues contain irritating saponins and oxalates. Rigid leaf tips and toothed margins can also scratch or puncture skin, eyes, mouths or paws.
• Exposure may cause mouth pain, drooling, vomiting, skin irritation or puncture wounds. Contact a veterinarian or medical professional if symptoms or an injury develop.

Where does the name Agave salmiana come from?

Agave comes from the Greek agauos, meaning noble, illustrious or admirable. The species epithet salmiana honours the German prince and botanist Joseph zu Salm-Reifferscheidt-Dyck, while ferox is Latin for fierce and refers to the strongly armed leaves.

Carl Linnaeus established the genus Agave in 1753 in Species Plantarum, page 323.

Joseph Franz Maria Anton Hubert Ignatz Fürst zu Salm-Reifferscheid-Dyck first described Agave salmiana in 1859 in Bonplandia (Hannover), volume 7, page 88; Christoph Friedrich Otto had proposed the name.