Mexican Blue Palm Trees. Brahea armata, Palm Family ( Palmae ) ( Arecaceae ), Mexican Blue Palm. Also Called: Blue Hesper Palm, Blue Palm, Sweet Brahea Palm, Gray Goddess, Erythea armata. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Mexican Blue Palm has a distinctive a unique and attractive shape similar to that of a Washingtonia Palm only smaller. An easy way to tell the difference is that the branching inflorescences are much longer with the Brahea armata palm. A mature Mexican Blue Palm can have up to 30 palmate, or fan shaped, circular leaves. Mexican Blue Palm will take full sunlight, but it also grows well in part sun/shade. When transplanting a Mexican Blue Palm, you should exercise extreme care to minimize damage to the root structure or individual roots. Quick Notes: Height: Up to 50 feet tall with a spread of 16 feet. Trunk: 12 to 18 inches in diameter. Flowers: Its flowers are on multiple branching inflorescences up to 3 feet long, which project out and downward from the leaf crown.Often longer than the leaves. Flowers are bisexual, male and female flowers are on the same inflorescence. Blooming Time: Southern Arizona, March - April. Phoenix Area, April - May. Seeds: The fruits are raddish brown & edible, round, and about � inch in diameter, they contain a single round seed. Leaves: The leaves are blue - white or aquamarine in color. They are very blue. Fan shaped, 36 to 72 inches wide, with 38 inch long petioles. Found: Native to the Pacific Coast of Mexico in Sonora, & mainly in Baja California. Elevation: 0 to 3,200 feet. Hardiness: Said to be hardy to 15 �F. But we don't recommend taking that chance. USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Partial Shade Habitat: Desert canyons and cliffs on rocky limestone soils. It needs good drainage and aeration. A sunny, warm, and well drained position. Drought, and frost tolerant. Also used for xeriscape landscaping in lower elevations in the Phoenix and Tucson areas of Arizona. Miscellaneous: Photos Taken January 25, 2006. Glendale Xeriscape Demonstration Garden, Glendale, Arizona. A low water use landscaping plant in the Phoenix and Tucson areas. Maintenance: Low.