Agave sobria Brandegee
Sober Agave
Agave sobria, described by Townshend Stith Brandegee in 1892, is an agave species endemic to the Baja California Peninsula and the adjacent coasts of Sonora, Mexico, along the Gulf of California. Its epithet 'sobria' alludes to its austere, restrained appearance, with compact rosettes of grey-green to blue-green leaves. It inhabits coastal xerophytic scrublands, palm groves, and arid hillsides from sea level to 800 m elevation. It includes subspecies subsp. sobria and subsp. frailensis (endemic to the Los Frailes area, BCS). It is of great importance to local wildlife as a nectar source during its nocturnal flowering.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Acaulescent to subcaulescent, compact, medium-sized rosette (50–90 cm tall, 80–120 cm diameter), monocarpic. Life cycle 10–25 years. Produces few basal offsets; natural propagation predominantly by seed. |
| Conservation Status | Subsp. frailensis considered at risk due to its extremely restricted range. Subsp. sobria with wider populations but subject to pressure from tourism, coastal development, and illegal collection. Listed under Mexico's NOM-059-SEMARNAT. |
| pH Target | 6.8–8.2 |
| Type | Sandy to sandy-loam soil, nutrient-poor, with fast drainage; may contain moderate salinity in coastal areas. Neutral to slightly alkaline pH. |
Origin & Habitat
Morphology
Lanceolate, rigid leaves 40–80 cm long and 6–10 cm wide, grey-green to blue-green with concave margin and brown terminal spine 2–4 cm long. Regular marginal teeth 4–8 mm, corneous, grey to light brown. Thick cuticle with pruinose wax reflecting intense solar radiation.
ecoOpen panicle 5–8 m tall with numerous lateral branches. Tubular pale yellow to cream flowers 6–9 cm long, fragrant, with exserted yellow anthers. Flowering predominantly nocturnal, June to August. Pollinated by bats of genus Leptonycteris (endemic long-nosed bats).
ecoStem very short or absent in the vegetative stage, becoming visible in very mature plants. The apical meristem accumulates large fructan reserves (up to 25% of fresh weight) that fuel the terminal flower scape.
ecoExtensive, shallow root system adapted to fast-draining coastal sandy soils. Under natural conditions roots may extend 4–5 m horizontally. Contractile roots present, stabilising the rosette on sandy slopes.
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Requirements
Soil & Substrate
Type
Sandy to sandy-loam soil, nutrient-poor, with fast drainage; may contain moderate salinity in coastal areas. Neutral to slightly alkaline pH.
groups Beneficial Associations
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Propagation Strategy
G
O
Every 5–8 years. Repot preferably in spring when the soil is warm.
Optional annual spring application with a very dilute, low-concentration fertiliser. In ground gardens, generally not necessary. Avoid high-nitrogen fertilisers.
Uses & Applications
Precautions / Toxicity
No significant documented toxicity to humans. Sap may cause mild skin and mucous membrane irritation. Spines represent the main physical hazard. No records of toxicity to domestic animals under normal conditions.
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Plant Health
Root and basal rot (Phytophthora/Fusarium)
Mealybug (Pseudococcus spp.)
Agave snout weevil (Scyphophorus acupunctatus)
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"Agave sobria shows an interesting disjunct distribution: Pacific Baja California and Gulf populations are genetically distinguishable. Subsp. frailensis from the Los Frailes area (BCS) has been proposed as an independent species by some recent authors, although most regional floras maintain it as a subspecies. It is a key species in the diet of migratory long-nosed bats (Leptonycteris yerbabuenae), contributing to connectivity of the pollination corridor between Mexico and the southwestern United States."
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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.