Agave filifera Salm-Dyck
Thread-leaf agave
Thread-leaf agave is a small and elegant agave from central Mexico, distinguished by the characteristic white filaments that peel from the margins of its dark green leaves. These filaments are not spines but epidermal fibres that naturally peel with age, creating a decorative effect highly valued in ornamental horticulture. It is native to the central Mexican plateau, growing in xerophilous scrublands at elevations of 1500–2500 m. Not to be confused with *Agave schidigera*, which has similar filaments but narrower leaves and a different habitat.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Compact and dense rosette, slow to moderate growth. Rarely produces basal offsets, propagating mainly by seeds. Monocarpic, flowers between 10 and 20 years. |
| Conservation Status | Least Concern (IUCN LC). Widely cultivated; wild populations are locally affected by agricultural expansion on the Mexican plateau. |
| pH Target | 6.0–7.5 |
| Type | Rocky to sandy, well-drained, low in nutrients |
Origin & Habitat
Morphology
Lanceolate, 30–60 cm long and 2–4 cm wide, shiny dark green with a grey central band. Margins bear white curled filaments that peel easily; terminal spine 2–3 cm, dark.
ecoSpike inflorescence 2–4 m tall. Flowers red-purple to yellow-green, 4–5 cm, arranged in pairs along the peduncle.
ecoStemless, with the stem hidden at the rosette centre. The piña is small compared to mezcal agaves, making this species of little interest for spirit production.
ecoCompact and fibrous root system, adapted to rocky and poor soils of the plateau. Roots are non-invasive, making it suitable for large containers.
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Requirements
Soil & Substrate
Type
Rocky to sandy, well-drained, low in nutrients
groups Beneficial Associations
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Propagation Strategy
S
O
Every 3–4 years. Thrives in relatively small containers.
One dose of half-strength cactus fertilizer in spring. Avoid excess nitrogen.
Uses & Applications
Precautions / Toxicity
Low to moderate. Terminal spine can cause puncture wounds. Sap contains saponins that irritate skin and mucous membranes.
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Plant Health
Crown rot (Fusarium spp.) from water accumulation between central leaves
Mealybugs (Pseudococcus spp.) — especially active at the base of the filaments
Agave snout weevil (Scyphophorus acupunctatus) — less common due to the small piña size but possible
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"One of the most popular agaves in cactus and succulent collections in Europe and North America. Its filaments are the defining taxonomic trait distinguishing it from *A. schidigera* (shorter filaments, narrower leaves) and *A. multifilifera* (more abundant filaments, larger rosette). The cultivar 'Compacta' is especially valued in cultivation. In Colombia, optimal for high-altitude gardens (Bogotá, Medellín)."
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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.