Baja Ocotillo. Fouquieria diguetii, Ocotillo Family ( Fouquieraceae ) Baja Ocotillo. Also Called: Fouquieria peninsular, Palo Adan, Adam's Tree. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Drought deciduous and they drop their leaves if they lack water. They might then look dead, but they aren't!. This variety is native of Baja California Mexico. It is a very close relative of Mexican Tree Ocotillo, Fouquieria macdougalii. However, Baja has more horizontal and crooked branches. Quick Notes: Height: Up To 20 feet tall and 4 feet wide. Most are about 6 - 8 feet. Trunk: Up to 3 inches in diameter. Bark: Brown - green, smooth; with paired, straight spines. Flowers: Panicles of red tubular flowers, about 1 inch long, occuring in spike-like clusters (12 to 20 inches long) near the tops of the tree. Blooming Time: Spring & Summer. Seed Pod: Light brown seeds in a 3 valved elongated (1 inch long) capsule. Leaves: Alternate, obovate, 1/2 to 1 1/2 inches long, with entire margins, fleshy, occuring in bunches, yellow-green to blue-green in color. Stems/Trunks: A redish-brown, finely furrowed bark. 3 to 14 inches in diameter. Found: Introduced from Baja Mexico. At 0 - 2,800 feet elevation. Elevation: 0 to 4,000 feet. Hardiness: 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: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) Sun Exposure: Full Sun Habitat: Sandy well drained desert soils. Rocky hillsides and alluvial plains. Low water use landscaping plant in the Phoenix, & Tucson, Arizona areas. Miscellaneous: Photos Taken February 27, 2008. Phoenix Arizona Desert Botanical Garden.