Agave ferox K.Koch
Fierce agave
Fierce agave is one of the most imposing and dramatic agaves in the genus, native to the Mexican states of Puebla and Oaxaca. Its epithet *ferox* (fierce, in Latin) refers to its enormous marginal teeth, which are among the most aggressive in the genus *Agave*. It forms massive rosettes of very broad dark green to grey-green leaves, with corneous teeth up to 1.5 cm that make the plant virtually impenetrable. It is currently recognised by many taxonomists as a synonym or variety of *Agave salmiana* var. *ferox*, though Koch originally described it as an independent species.
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Massive solitary rosette, slow-growing. Rarely produces offsets. Monocarpic: flowers once between 20 and 35 years with an imposing spike and dies after seed production. |
| Conservation Status | Not independently assessed (considered by some as a synonym of *A. salmiana* var. *ferox*). Wild populations in Puebla and Oaxaca are not currently threatened. |
| pH Target | 6.0–8.0 |
| Type | Stony to sandy, calcareous or volcanic, well-drained |
Origin & Habitat
Morphology
Very broad and robust, 80–150 cm long and 15–25 cm wide, dark green to grey-green. Margins with corneous teeth up to 1.5 cm, dark brown-black, strongly curved and sharp; terminal spine 4–7 cm, very stout.
ecoBranched panicle inflorescence 6–10 m tall. Yellow-green flowers 7–10 cm, produced in large clusters on the terminal branches of the scape.
ecoShort to stemless, but the piña is large and fibrous, 40–70 cm, rich in carbohydrates. Related to pulque and aguamiel production in its home regions.
ecoExtensive and shallow root system. Roots spread in all directions up to 4–5 m from the rosette centre to maximise rainwater capture.
ecochevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Requirements
Soil & Substrate
Type
Stony to sandy, calcareous or volcanic, well-drained
groups Beneficial Associations
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Propagation Strategy
V
P
Every 4–6 years in a large container; definitively better in permanent outdoor planting.
Minimal fertilization: one dose of low-nitrogen fertilizer (5-10-10) in spring every two years.
Uses & Applications
Precautions / Toxicity
Moderate. Marginal teeth cause severe lacerations. Sap can produce intense contact dermatitis. Extremely hazardous to children and pets due to spines.
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Plant Health
Root rot (Phytophthora spp., Fusarium spp.) from overwatering in compacted soil
Mealybugs (Pseudococcus spp.) — difficult to detect between marginal teeth; periodic inspection essential
Agave snout weevil (Scyphophorus acupunctatus) — highly destructive in large specimens; larvae collapse the entire piña
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
"The taxonomic position of *A. ferox* Koch is debated: many modern authors synonymise it with *A. salmiana* var. *ferox*, but Koch (1860) described it from cultivated material from Puebla as an independent species. For horticultural purposes, specimens under the name *ferox* tend to show larger teeth and broader rosettes than typical *salmiana* material. Always plant with ample safety margin (minimum 2 m) from pathways."
chevron_right edit_note Proposed edits auto-approved at +3 net votes
No pending proposals for this section.
Scientific Integrity
🟡 MediumVote to help validate this record
Sources
Loading…
Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.