Agave difformis A.Berger
Variable Agave
Agave difformis, described by German botanist Alwin Berger in 1915, takes its name from the Latin 'difformis' (irregularly shaped or variable), referring to the notable morphological variability it shows between different populations in central-eastern Mexico. It is distributed in the states of Hidalgo, Tamaulipas, and Veracruz, inhabiting xerophytic scrublands, calcareous slopes, and edges of tropical dry forests between 500 and 1800 m altitude. It is also known under the synonym Agave haynaldii. It is appreciated in horticulture for its shiny dark green leaves and elegant rosette.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Medium rosette, generally solitary, with moderately erect leaves. Intraspecific variability is notable: some populations have narrower leaves and others wider leaves. |
| Conservation Status | Not formally evaluated (NE) by IUCN. Locally common within its native range; faces no immediate extinction threats. |
| pH Target | 6.5–8.0 |
| Type | Calcareous, volcanic, well-drained |
Origin & Habitat
Morphology
Shiny dark green, lanceolate, 60–90 cm long and 8–12 cm wide, with wavy margins armed with well-developed corneous teeth and a dark apical spine of 3–5 cm.
ecoYellow, arranged in a panicle 4–6 m tall with numerous lateral branches. Single flowering after 20–35 years. Bats are important pollinators.
ecoAcaulescent, with leaf bases forming a compact and resistant structure. The floral scape emerges vertically from the center of the rosette in the flowering year.
ecoFibrous, extensive and shallow root system, capable of colonizing cracks in calcareous substrates. Absorption roots develop rapidly after rainfall.
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Requirements
Soil & Substrate
Type
Calcareous, volcanic, well-drained
groups Beneficial Associations
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Propagation Strategy
O
T
Every 3–4 years or when the root system outgrows the container.
Fertilize once in spring with cactus and succulent fertilizer, low in nitrogen.
Uses & Applications
Precautions / Toxicity
Puncturing apical spines; sap can cause dermal irritation on prolonged contact.
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Plant Health
Crown rot (Botrytis cinerea) under high humidity conditions
Mealybug (Planococcus spp.) at leaf bases
Agave snout weevil (Scyphophorus acupunctatus) — affects the central meristem
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"The notable morphological variability of this species has generated historical taxonomic confusion and several synonyms. Modern molecular studies confirm its distinction from A. lophantha and other related agaves of northeastern Mexico."
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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.