Far south of the arid Chihuahuan Desert, far from the Colorado Plateau and the Great Plains where most yuccas find their home, a tall, multi-branched tree yucca stands in the pine-oak forests and tropical deciduous woodlands of the Jalisco highlands — the heartland of tequila country. Yucca jaliscensis, the Jalisco yucca or izote, is the most geographically isolated species in the genus: its native range in southwestern Mexico (Jalisco, Colima, Guanajuato) is separated from its closest relatives by hundreds of kilometers of tropical lowlands. This isolation has produced a tree of remarkable stature — up to 10 m tall, with a thickened trunk base up to 1.5 m in diameter on old specimens — that was long confused with the hybrid Yucca × schottii before Trelease recognized it as a distinct species in 1920. Perhaps most astonishing, old specimens in Albuquerque, New Mexico have survived temperatures below −15 °C (5 °F) — a cold hardiness completely unexpected for a Mexican tropical-highland tree. For gardeners and collectors, Yucca jaliscensis — a species in the genus Yucca — is a botanical anomaly: a giant, tropical-looking tree yucca that can survive in continental climates, is virtually unknown in cultivation, and carries the flavor of Mexico’s Pacific highlands in every blue-green leaf.
Quick Facts
| Scientific name | Yucca jaliscensis (Trel.) Trel. |
| Family | Asparagaceae (subfamily Agavoideae) |
| Origin | Southwestern Mexico: Jalisco, Colima, Guanajuato |
| Adult size | Up to 10 m tall; spread to 6 m; trunk base to 1.5 m diam. |
| Hardiness | −12 to −15 °C (10 to 5 °F) / USDA zones 7b–10 |
| IUCN | Not assessed (rare, geographically isolated) |
| Cultivation difficulty | 3/5 |
Taxonomy and Nomenclature
Yucca jaliscensis has a two-stage taxonomic history. William Trelease first treated the Jalisco populations in 1902 as Yucca × schottii var. jaliscensis — a variety of the hybrid yucca from the Arizona-Sonora borderlands. However, further study revealed that the Jalisco plants were clearly distinct: more branched, larger in overall size, and geographically isolated from Yucca × schottii by hundreds of kilometers of lowland. In 1920, Trelease elevated it to species rank as Yucca jaliscensis (Trel.) Trel.
The specific epithet refers to the Mexican state of Jalisco — the core of the species’ range and one of the most culturally and agriculturally important states in Mexico (home of tequila, mariachi, and the Volcán de Colima).
The type specimen was collected by Cyrus Guernsey Pringle (1838–1911), one of the most prolific American botanical collectors of the late 19th century, on May 13, 1893, in the Valley of Zapotlán (now Ciudad Guzmán), Jalisco (Pringle 4392, US).
Classification. POWO classifies Yucca jaliscensis as a tree growing in the seasonally dry tropical biome, native to southwestern Mexico (to Guanajuato). The species is closely related to Yucca × schottii, Yucca madrensis, and Yucca grandiflora — all fleshy-fruited tree yuccas of the Sierra Madre Occidental. The fleshy fruit places it in the Aloifolia clade (section Sarcocarpa).
Family and subfamily. Asparagaceae, subfamily Agavoideae (APG IV, 2016).
Synonyms (POWO)
- Yucca × schottii var. jaliscensis Trel. (1902) — the original varietal designation
- Yucca barrancasecca Pasq. (1867) — described from cultivated material in Naples, Italy
The Naples Connection — Yucca barrancasecca
The synonym Yucca barrancasecca Pasquale (1867) is a fascinating footnote: it was described from a plant growing in the Orto Botanico di Napoli (Naples Botanical Garden), Italy, listed in their catalogue. The epithet barrancasecca — Spanish for “dry ravine” — suggests the plant was originally collected from a barranca (canyon) in Mexico, brought to Naples, and described there before the wild populations were formally studied. This makes Yucca jaliscensis one of the rare yuccas with a European type predating the recognition of the wild species — a reversal of the usual sequence in New World botany.
Common Names
English: Jalisco yucca, Jalisco soapwort, izote yucca. Spanish (local): izote — a generic Mexican term for tree yuccas, derived from the Nahuatl iczotl.
Morphological Description
Habit and Stem
Yucca jaliscensis is one of the largest yuccas in the genus. It is a tall, tree-like species that can grow up to 10 m (33 feet) in height with a spread of up to 6 m (20 feet), though most specimens are found at less than 7.5 m (25 feet). The trunk may be single or mildly multi-trunked, with a somewhat thickened trunk base that ranges from 15–60 cm wide in typical specimens but can exceed 120–150 cm (4–5 feet) in diameter on old specimens — an impressively swollen base that gives mature trees an almost pachycaul appearance. From the short trunk, 5 to 8 branches grow upright, each topped with a rosette of leaves.
Leaves
The leaves are stiff to flexible, variably blue to green, strap-like, spineless, up to 1 m (3 feet) long and up to 8 cm (3 inches) wide. The spineless character is notable — making this one of the less dangerous tree yuccas to work around. The blue-green coloration, particularly pronounced in full sun, gives the crown a distinctive glaucous appearance.
Inflorescence and Flowers
The inflorescence produces dense, showy clusters of white flowers on tall spikes. Easyscape describes blooming from September to May — an exceptionally long flowering season, much longer than the spring-only flowering of the temperate North American species. Notes from the Road mentions that the seedpods were used as maracas by indigenous peoples due to their hollow, rattling sound — a unique ethnobotanical detail. Plant Delights describes the flowers as “hummingbird friendly.”
Fruits and Seeds
The fruit is fleshy and indehiscent — consistent with placement in the Sarcocarpa group. The hollow, rattling mature seedpods suggest that the fruit dries partially with age, the seeds becoming loose inside the pod and creating the maraca-like sound that indigenous peoples exploited.
Similar Species and Frequent Confusions
Yucca × schottii Engelm. — Schott’s Yucca
The species from which Yucca jaliscensis was originally described as a variety. Yucca × schottii is a natural hybrid from the Arizona-Sonora borderlands — smaller, less branched, and geographically distant. The separation as a distinct species is based on the larger overall size, more extensive branching, and geographic isolation of the Jalisco populations.
Yucca grandiflora Gentry — Large-flowered Yucca
A closely related fleshy-fruited tree yucca from the Sierra Madre Occidental (Sonora/Chihuahua). Yucca grandiflora has the largest individual flowers in the genus; Yucca jaliscensis is the larger tree. The two are geographically separated: Yucca grandiflora is northern Sierra Madre, Yucca jaliscensis is southwestern Mexico.
Yucca madrensis Gentry — Sierra Madre Yucca
Another Sierra Madre relative. Yucca madrensis is a shrub (not a 10 m tree), with narrower leaves and serrate margins. The smaller stature and different leaf morphology are the clearest diagnostics.
Distribution and Natural Habitat
Yucca jaliscensis is native to the highlands of southwestern Mexico, in the states of Jalisco, Colima, and Guanajuato, on plains and low hills between approximately 900 and 2,100 m (3,000–7,000 feet). POWO describes the biome as “seasonally dry tropical.”
The habitat diversity is remarkable for a single yucca species:
- Pine-oak forests near winding stream gorges — the most common habitat
- Forested ravines (barrancas) and narrow, winding stream gorges
- Deciduous tropical forests
- Dry hills and steep rocky volcanic slopes with semi-arid, rocky, subtropical short oak forests
- Open fields with corn or other crops — suggesting tolerance of agricultural disturbance
The species is associated with Agave colimana and other Agave species — placing it in the agave-rich landscapes of the Trans-Mexican Volcanic Belt and the Sierra Madre del Sur.
An important ecological note: Yucca jaliscensis is “often grown as an ornamental around homes or settlements and is not found in the wild often”. This suggests that the species may be semi-domesticated or at least culturally maintained — a pattern common among useful plants in Mesoamerican landscapes. The boundary between “wild” and “cultivated” is blurred, as it is for many agaves and yuccas in Mexico.
Geographic Isolation
Yucca jaliscensis is described as “rare and geographically isolated from other representatives”. The Jalisco highlands are separated from the Sonora/Chihuahua homeland of its closest relatives (Yucca × schottii, Yucca grandiflora, Yucca madrensis) by hundreds of kilometers of Pacific coastal lowlands and the tropical Balsas Basin. This isolation has allowed morphological divergence (larger size, more branching) and raises questions about the historical biogeography of the genus: did tree yuccas once have a continuous Sierra Madre distribution that was fragmented by Pleistocene climate changes, leaving Yucca jaliscensis as a relict population?
Conservation
Yucca jaliscensis has not been formally assessed by the IUCN. Given its rarity in the wild, geographic isolation, limited range (three Mexican states), and the ongoing deforestation and agricultural expansion in the Jalisco highlands, the species is potentially vulnerable. The semi-domesticated status (commonly grown around settlements) provides some cultural protection but does not guarantee the survival of wild populations.
Cultivation
| Parameter | Value |
|---|---|
| Hardiness | −12 to −15 °C (10 to 5 °F) / USDA zones 7b–10 |
| Light | Full sun |
| Soil | Well-drained; tolerates a variety of soil types |
| Watering | Low to moderate; drought-tolerant |
| Adult size | Up to 10 m tall × 6 m spread |
| Growth rate | Moderate |
| Difficulty | 3/5 |
Light
Full sun is optimal. The species grows in open woodlands and on exposed volcanic slopes.
Soil and Drainage
Wikipedia states that the species “can be grown in a variety of soils” — a greater edaphic flexibility than most yuccas, reflecting the range of substrates in its native habitat (volcanic, limestone, agricultural soils). Well-drained soil is still important, but Yucca jaliscensis is more tolerant of different soil types than the deep-sand specialists or limestone-obligate species.
Cold Hardiness — The Albuquerque Surprise
This is the most remarkable cultivation fact about Yucca jaliscensis. Wikipedia reports: “In dry conditions, Yucca jaliscensis has been cold hardy in Albuquerque, New Mexico where temperatures can fall below 5 °F [−15 °C]” (pers. comm. Ferguson). Old specimens can be admired in Albuquerque.
A tropical Mexican tree yucca surviving −15 °C in New Mexico is a genuine anomaly. The Jalisco highlands at 1,500–2,100 m do experience cool winters (occasional light frost), but nothing approaching the continental cold of Albuquerque. The dry cold of the high desert apparently allows the species to survive temperatures far below those encountered in its native range — a pattern observed in other Mexican agavoids (some Agave species from highland Mexico are more cold-hardy than expected when grown in dry continental climates).
This cold hardiness makes Yucca jaliscensis potentially viable in USDA zone 7b — a much wider cultivation range than its tropical origin would suggest.
Growth Rate and Space
Moderate. At 10 m tall × 6 m spread, a mature Yucca jaliscensis is one of the largest yuccas that can be grown in a garden. The thickened trunk base (up to 1.5 m diameter on old specimens) requires significant ground space. Plan accordingly.
Propagation
By suckers, cuttings, or seed. The multi-trunked habit and basal suckering provide vegetative propagation opportunities. Seeds from the fleshy fruit can be cleaned and sown in well-drained mineral mix at 20–25 °C.
What to Know Before Buying
Availability. Yucca jaliscensis is “little known and rare in cultivation”. Plant Delights Nursery (North Carolina) has trialed it, describing it as a first-time offering for “adventurous gardeners.” Specialist Mexican succulent growers may have seed or young plants. The species is virtually unknown in European horticulture.
Size at maturity. At up to 10 m tall and 6 m wide, with a trunk base potentially reaching 1.5 m in diameter, this is one of the largest yuccas you can grow. It is not a small-garden or container plant (except as a juvenile).
The Albuquerque test. If you are in USDA zone 7b or warmer with dry winters, the Albuquerque experience suggests Yucca jaliscensis may survive outdoors. In humid-winter climates, winter protection or container culture with indoor overwintering is advisable.
Pests and Diseases
Agave snout weevil (Scyphophorus acupunctatus): The thick trunk and large size make Yucca jaliscensis vulnerable. The Jalisco region is within the weevil’s core Mexican range. Monitor for frass, soft tissue, and wilting rosettes.
Root rot: In heavy, waterlogged soils, especially in winter.
Landscape Use
Monumental specimen tree: A mature Yucca jaliscensis is one of the most imposing yuccas that can be grown in a warm-temperate or subtropical garden. The multi-branched crown, blue-green spineless foliage, and massive trunk base create an architectural presence comparable to a Joshua tree (Yucca brevifolia) but with a more lush, tropical character.
Mexican Pacific highland theme gardens: In California, the American Southwest, or Mediterranean gardens, Yucca jaliscensis evokes the landscapes of Jalisco — agave fields, volcanic slopes, and pine-oak barrancas. Plant alongside Agave tequilana, Agave colimana, Bursera spp., and Ipomoea arborescens.
Botanical gardens: An essential acquisition for any institution with a comprehensive New World agavoid collection. The geographic isolation, the Naples (barrancasecca) connection, and the Albuquerque cold-hardiness story make it an outstanding teaching specimen.
Frequently Asked Questions
Why is it called “izote”?
“Izote” (from the Nahuatl iczotl) is a generic Mexican term for tree yuccas. It is used for several species, not just Yucca jaliscensis. In El Salvador, Yucca gigantea is the “izote” par excellence — its flowers are the national dish.
Is it really cold-hardy?
Surprisingly, yes. Old specimens in Albuquerque, New Mexico have survived temperatures below −15 °C (5 °F) in dry conditions. USDA zone 7b is a reasonable estimate for well-drained, dry-winter sites. Humid-winter cold is likely more damaging than dry-winter cold at the same temperature.
How does it differ from Yucca × schottii?
Yucca jaliscensis was originally described as a variety of Yucca × schottii but is clearly distinct: larger overall (up to 10 m vs. 4–5 m), more extensively branched (5–8 branches vs. fewer), with a thicker trunk base, and geographically isolated in Jalisco (vs. Arizona-Sonora borderlands).
What is the barrancasecca story?
The synonym Yucca barrancasecca was described in 1867 from a plant growing in the Naples Botanical Garden, Italy — predating Trelease’s recognition of the wild species by decades. The name means “dry ravine” in Spanish, suggesting the original plant was collected from a Mexican barranca and brought to Naples.
Can I use the seedpods as maracas?
According to Notes from the Road, indigenous peoples of the Jalisco region used the dried seedpods of Yucca jaliscensis as maracas due to their hollow, rattling sound. This is a unique ethnobotanical use not documented for any other yucca species.
Reference Databases and Online Resources
- POWO — Yucca jaliscensis
- iNaturalist — Yucca jaliscensis
- GBIF — Yucca jaliscensis
- YuccaAgavaceae.com — Yucca jaliscensis
- Plant Delights Nursery — Yucca jaliscensis
Bibliography
McKelvey, S.D. (1938–1947). Yuccas of the Southwestern United States. 2 volumes. Arnold Arboretum, Harvard University.
Trelease, W. (1902). Yucca × schottii var. jaliscensis. In: The Yucceae. Report (Annual) Missouri Botanical Garden 13: 99.
Trelease, W. (1920). Yucca jaliscensis. [elevation to species rank]
Pasquale, G.A. (1867). Yucca barrancasecca. In: Catalogus Horti Botanici Neapolitani: 108.
Gentry, H.S. (1972). The Agave Family in Sonora. USDA Agricultural Handbook 399. 195 pp. [p. 161, reference to type]
Eggli, U. (ed.) (2001). Illustrated Handbook of Succulent Plants: Monocotyledons. Springer-Verlag.
Espejo Serna, A. & López-Ferrari, A.R. (1993). Las Monocotiledóneas Mexicanas: una Sinopsis Florística 1(1): 1–76. Consejo Nacional de la Flora de México.
Hochstätter, F. (2004). Yucca (Agavaceae). Volume 3: Mexico and Baja California. Selbstverlag.