Agave horrida Lem. ex Jacobi
Horrible agave / Fierce agave
Agave horrida owes its name to the impressive and fearsome corneous teeth that adorn the margins of its leaves, making this plant a practically impassable physical barrier. It is a medium-sized species that forms dense, compact rosettes with relatively short but fiercely armed leaves bearing curved, complex teeth up to 1.5 cm. Native to the arid slopes of central Mexico (State of Mexico, Puebla, Hidalgo), it lives at elevations of 1,800–2,600 m where it combines tolerance of moderate cold with a pronounced summer drought. It is a highly prized ornamental for its aggressive architecture.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Dense, compact rosette, medium-sized, with relatively short and heavily armed leaves. Produces occasional basal offsets. Short stem but visible in mature plants. |
| Conservation Status | Least Concern (LC) — IUCN. Established populations in several mountain ranges of central Mexico. |
| pH Target | 6.5–8.0 |
| Type | Porous mineral, volcanic or calcareous, well-drained |
Origin & Habitat
Morphology
Ovate-lanceolate, 25–50 cm long, 6–10 cm wide at base, dark green to grey-green, stiff. Margins with robust, curved, secondarily denticulate corneous teeth, reddish-brown, spaced 0.5–1.5 cm. Terminal spine 3–5 cm, channeled, very sharp.
ecoYellowish-green to yellow, 5–7 cm, in a branched panicle on a 3–5 m scape. Single bloom at end of life cycle (10–20 years). Attract bats and nocturnal moths.
ecoCaudex 10–25 cm tall visible in mature plants, dense and woody. Leaf teeth persist on the stem as scars.
ecoModerately deep root system for rocky slope soils. Fibrous roots with dense branching in surface horizons.
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Requirements
Soil & Substrate
Type
Porous mineral, volcanic or calcareous, well-drained
groups Beneficial Associations
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Propagation Strategy
D
O
Every 4–6 years; slow-growing. Use thick gloves and wooden tongs when handling.
A single application of slow-release granular mineral fertilizer at the start of spring. No fertilization in autumn or winter.
Uses & Applications
Precautions / Toxicity
Very physically hazardous: teeth and terminal spine can cause deep wounds. Sap moderately irritating. Keep out of reach of children and domestic animals.
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Plant Health
Crown rot (Phytophthora spp.) — in pot cultivation with insufficient drainage or overwatering in winter; symptoms: soft, yellowing basal leaves.
Root mealybugs (Rhizoecus spp.) — detectable at repotting; treat with imidacloprid drench.
Agave snout weevil (Scyphophorus acupunctatus) — serious threat in outdoor collections; on the central plateau the risk is moderate but real.
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"The epithet 'horrida' (horrible, causing horror) was coined by Lemaire in direct reference to the terrifying marginal teeth, which in wild specimens can cause serious injuries even through thick clothing. Despite its intimidating appearance, it is a relatively cold-tolerant and straightforward plant to grow in mountain zones."
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Scientific Integrity
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Sources
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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.