Agave delamateri W.C.Hodgson & Slauson
Delamater's Agave
Agave delamateri is a species endemic to Yavapai County, in north-central Arizona, described by W.C. Hodgson and Slauson in 1995. It inhabits the margins of pine-juniper forests and manzanita chaparrals at elevations of 1100–1800 m above sea level. It is one of the highest-altitude agaves in the southwestern United States and shows notable adaptations to the winter cold that characterizes the Arizona plateau. The IUCN classifies it as a threatened species due to its extremely restricted distribution and pressure from extensive livestock grazing on its wild populations.
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Overview
| Category | Classification |
|---|---|
| Family | Asparagaceae |
| Genus | Agave |
| Growth Habit | Medium to large rosette, solitary or forming small groups. Moderately erect leaves forming a characteristic crown. Life cycle of 15–30 years until flowering. |
| Conservation Status | Threatened according to IUCN criteria; included on the Prescott National Forest sensitive plants list. Threats: grazing, illegal collection, climate change. |
| pH Target | 6.5–8.0 |
| Type | Loamy, clay-loam, rocky |
Origin & Habitat
Morphology
Gray-green to blue-green, lanceolate, 60–100 cm long and 10–15 cm wide, with slightly concave surface. Margins with rhombic gray to black teeth spaced 1–3 cm apart, and a robust apical spine of 4–7 cm.
ecoYellow to yellow-orange, in a panicle 4–7 m tall with spreading lateral branches. Flowering is the plant's final act; pollinators include bats and hummingbirds.
ecoShort and robust, acaulescent. Leaf bases mark a compact spiral pattern. Before flowering it may develop a caudex up to 40 cm.
ecoDeep fibrous and extensive lateral roots. Deep root penetration allows it to exploit subsurface moisture during summer drought periods.
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Requirements
Soil & Substrate
Type
Loamy, clay-loam, rocky
groups Beneficial Associations
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Propagation Strategy
S
E
Every 4–6 years; prefers wide and deep containers.
Very limited fertilization: a small dose of low-nitrogen fertilizer once in spring.
Uses & Applications
Precautions / Toxicity
Long robust apical spines pose a risk of eye and skin injury. Handle with adequate protection.
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Plant Health
Root rot (Phytophthora cinnamomi) from waterlogging in winter
Mealybug (Pseudococcus spp.) in cultivation conditions
Agave snout weevil (Scyphophorus acupunctatus) — primary threat in natural habitat
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"Discovered and described relatively late for the genus Agave (1995). Collection for private gardens has decimated some local populations. Cultivation in botanical gardens is crucial as ex situ insurance."
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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.