Agave cerulata Trel.
Baja California Blue Agave
Agave cerulata is an agave endemic to the Baja California Peninsula, Mexico, recognizable by its striking grey-blue (cerulean) leaves that give it its name. It inhabits coastal and interior xeric scrub on rocky and sandy soils in arid to semi-arid terrain. It is a relatively compact species with rigid toothed leaves and has several subspecies (cerulata, dentiens, subcerulata, nelsonii) occupying different zones of the peninsula. Its intense glaucous coloration results from a protective waxy cuticle against intense solar radiation and desiccation.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Acaulescent, medium rosette (50–100 cm diameter); monocarpic; produces few basal offsets; slow growth; flowering after 15–25 years. |
| Conservation Status | Least Concern (LC) — endemic to Baja California; some subspecies with more restricted distributions are being monitored. |
| pH Target | 7.0–8.5 |
| Type | Sandy to stony, caliche; perfect drainage |
Origin & Habitat
Morphology
Lanceolate, 30–70 cm long and 5–9 cm wide; intensely grey-blue to silvery-glaucous color; margins with regular curved brown or grey teeth; terminal spine 2–5 cm, dark and channeled.
ecoYellow to yellow-green, 5.5–7 cm, arranged on a 3–6 m spike with dense lateral branches in the upper third.
ecoVery short or absent in the vegetative plant. The floral scape is robust, erect, with prominent bracts at its base.
ecoExtensive shallow fibrous roots adapted to capturing water from scarce seasonal rainfall; very sensitive to waterlogging.
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Requirements
Soil & Substrate
Type
Sandy to stony, caliche; perfect drainage
groups Beneficial Associations
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Propagation Strategy
B
O
Repot only when strictly necessary (roots overflowing); every 4–5 years.
Does not require regular fertilization. A very light application of phosphorus fertilizer (NPK 5-10-5) in spring can enhance glaucous coloration.
Uses & Applications
Precautions / Toxicity
Sap irritating to sensitive skin. Terminal spines and marginal teeth are hazardous; use gloves when handling. Not considered systemically toxic.
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Plant Health
Root rot (Phytophthora cinnamomi) — in poorly drained substrates; fatal if not detected early.
Mealybugs (Dysmicoccus spp.) — attacks leaf bases and surface roots; inspect periodically.
Agave snout weevil (Scyphophorus acupunctatus) — primary threat; larvae destroy the crown; preventive treatment with imidacloprid.
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"The grey-blue coloration of A. cerulata is one of the most pronounced in the genus, comparable to A. parryi. Subspecies differ mainly in the size of marginal teeth and leaf shape: dentiens has the most pronounced teeth, while subcerulata is smaller and more compact. The species is a good indicator of well-drained soils in arid gardens."
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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.