Dasylirion longissimum by bancroftgarden.
Dasylirion longissimum-5
Common Name Mexican Grass Tree, Toothless Sotol
Latin Name Dasylirion longissimum
Native Habitat Between 0 and 8,000 feet in northwest Mexico
Soil Dry decomposed granite, sand, clay loam, limestone, low organic content
Water Once each month, none once established
Height X Width 6 feet X 6 feet
Protective Mechanism Spines
Leaves Blue-green 6 feet long, evergreen
Garden Suitability Songbird, Sonoran
Ornamental Value White flowers after red buds, stalk up to 15 feet tall in mid-summer, dioecious
Nature Value Attracts bees, butterflies, and birds
Native American Uses Unknown
    Images and data http://www.delange.org/GrassTreeMex/GrassTreeMex.htm
    Images and data http://davesgarden.com/guides/pf/go/56975/
    Nursery, images, and data http://www.smgrowers.com/products/plants/plantdisplay.asp?plant_id=495
    Nursery, images, and data http://www.sunnygardens.com/garden_plants/dasylirion/dasylirion_0974.php
    Images and data http://msuplants.com/pd.asp?pid=3834
    Images and data http://www.desert-tropicals.com/Plants/Agavaceae/Dasylirion_longissimum.html
    Data http://www.practical-garden-shrubs.com/white/Dasylirion-Longissimum-White-flowers-.html