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| Category: Bamboo |
| Family: Poaceae (Gramineae) (Grasses) |
| Origin: Mexico (North America) |
| Evergreen: Yes |
| Bloomtime: Infrequent |
| Synonyms: [O. acuminata ssp. aztecorum, Yushania aztecorum] |
| Height: 15-20 feet |
| Width: Clumping |
| Exposure: Sun or Shade |
| Seaside: Yes |
| Irrigation (H2O Info): Medium Water Needs |
| Winter Hardiness: 20-25° F |
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Otatea acuminata (Mexican Weeping Bamboo) - A graceful clump forming bamboo with arching culms that can reach to 20 feet tall but is most often seen at around 15 feet tall by an equal width. The canes, which are solid when young , can grow to a diameter of 1 to 1 ½ inches and are densely clothed with long, very thin, light green leaves that are somewhat pendulous, lending the plant a soft appearance. Plant in full to part sun where it is somewhat drought tolerant once established in coastal gardens, but looks best with regular to occasional irrigation. Hardy to 22F and even lower for short durations (took 18° F in 1990 freeze without damage). Like most bamboo, this plant is monocarpic, meaning that it only flowers once and then the plants decline and die. In Eduardo Ruiz-Sanchez, Victoria Sosa, M. Teresa Mejía-Saules, X. Londoño, and L. G. Clark's 2011 article titled "A Taxonomic Revision of Otatea (Poaceae: Bambusoideae: Bambuseae) Including Four New Species." in Systematic Botany (v.36, n. 2) it was noted that this species flowers every 17 to 30 years and the flowering period can last 2 to 3 years. Otatea acuminata is native to Sonora, Chihuahua, Sinaloa, Durango, Nayarut, Jalisco, Michoácan and Guerrero provinces of Mexico. This species was described by American botanist and bamboo authority Dr. Floyd Alonzo McClure, who placed the new genus Otatea as a subgenus within Yushania with two New World species, Yushania acuminatum and Y. aztecorum. This work was published in 1973, three years after Dr. Mclure had passed away. The subgenus was elevated to generic status in 1980 by the Argentine botanist Cleofé Calderón and American botanist Thomas R. Soderstrom, who was then curator of grasses at the Smithsonian and Soderstrom later merged Otatea aztecorum into Otatea acuminatum as a single species. Subsequent treatment in 1984 by the Mexican botanist Rafael Guzmán Mejia Guzman treated Otatea aztecorum as a subspecies of Otatea acuminatum, but the current treatment has again synonomized them both as Otatea acuminatum. The name for the genus comes from the Nahuatl (Aztec) word 'otatl', meaning "bamboo" and in Mexico plants in the genus are often referred to as Otates. The specific epithet is from the Latin word 'acumino', meaning to "sharpen" or "make pointed" in reference to the narrow leaves that taper to a point. This bamboo was reportedly first introduced into the U.S. from central western Mexico around 1958 by the California Arboretum Foundation, now The Los Angeles County Arboretum and Botanic Garden. Before the plant was officially named, San Diego plantsman Bill Teague received a division of it from the Arboretum in 1966 and began propagating it and then distributing it to fellow collectors and nurserymen throughout southern California. We first received this plant as Yushania aztecorum and began growing it in 1982. Plants from our first crops and those at Abe Nursery in Carpinteria flowered in the early 1990's, producing viable seed that produced most of the plants now in cultivation in southern California gardens. This 1990 generation of plants began flowering thirty years later in 2020 and we are now offering seedlings from this more recent flowering event, which will hopefully give us 30 more years of having this beautiful bamboo in our gardens.
The information displayed on this page is based on research conducted about this plant in our library and from reliable online sources. We also consider observations that we have made of it growing in the nursery's garden and in other gardens, as well how it has performed in our crops out in the nursery field. We will incorporate comments that we receive from others as well, and welcome hear from anyone who may have additional information, particularly if they have knowledge of cultural information we do not mention that would aid others in growing Otatea acuminata.
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