Agave geminiflora (Tagl.) Ker Gawl.
Twin-flower agave / Gemini agave
Agave geminiflora is arguably the world's most popular ornamental agave, thanks to its exceptional architecture: it forms a perfectly spherical rosette of hundreds of very narrow, flexible, glossy dark-green leaves adorned with delicate white filaments that curl outward. Its name refers to the botanical peculiarity of producing flowers in pairs on each branch of the floral scape. Compact and elegant, it adapts perfectly to pots, modern gardens, and Mediterranean landscaping designs. It is endemic to the highlands of Nayarit and Jalisco in Mexico.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Dense, symmetrical, globose rosette, without lateral offsets in most cases. Leaves very numerous (200–300), linear, 40–70 cm long, with wavy white filaments along the margins. Stem practically absent. |
| Conservation Status | Endangered (EN) — IUCN. Endemic to a restricted area of the Sierra Madre Occidental; threatened by illegal collection and habitat loss. |
| pH Target | 6.0–7.5 |
| Type | Porous mineral, well-drained, slightly acid to neutral |
Origin & Habitat
Morphology
Linear to subulate, very narrow (3–6 mm wide), 40–70 cm long, leathery, dark green with faint pruinescence. Margins with curved white filaments; terminal spine thin, 1–2 cm.
ecoYellowish-green to reddish, in pairs on each secondary peduncle (diagnostic character of the epithet 'geminiflora'). Scape 3–5 m. Single bloom at end of life cycle (8–20 years).
ecoAcaulescent or nearly so; the rosette emerges at ground level. Does not produce offsets under normal conditions, so the plant dies completely after flowering.
ecoFibrous and shallow, adapted to highland soils with a pronounced dry season. No reproductive rhizomes.
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Requirements
Soil & Substrate
Type
Porous mineral, well-drained, slightly acid to neutral
groups Beneficial Associations
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Propagation Strategy
S
O
Every 3–5 years; very sensitive to repotting in summer, prefer early spring.
Low-phosphorus slow-release fertilizer once in spring. Never in autumn or winter.
Uses & Applications
Precautions / Toxicity
Sap moderately irritating. The terminal spine is thin but sharp. No systemic toxicity reported in humans. Keep away from young children.
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Plant Health
Root and crown rot (Fusarium oxysporum) — common in pots without drainage; base becomes soft and dark.
Root mealybugs (Rhizoecus spp.) — hard to detect until the plant declines; treat with systemic drench.
Agave snout weevil (Scyphophorus acupunctatus) — less frequent in potted specimens but a serious threat in outdoor collections.
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"Since it does not produce offsets under normal conditions, commercial propagation relies entirely on seeds or laboratory divisions. This, combined with its EN status, means nursery specimens should come from legal SEMARNAT-permitted collections or already-established ex-situ material. Verify provenance before purchasing."
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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.