Orange Bells. Tecoma garrocha, Bignonia Family: ( Bignoniaceae ) , Orange Bells. Also Called: Tecoma fulva, Hieron. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Orange Bells is a five foot high shrub with pinnate leaves and racemes of orange-salmon funnelform 2 inch long flowers. native of Bolivia, & Argentina. Hardy to at least 22�F. Experiences in the Phoenix metro area suggests that Orange Bells are hardy to 20 �F. However, some frost injury to branch tips has been observed at temperatures below freezing. The roots are very cold hardy so even plants that freeze to the ground grow back rapidly in spring. Orange Bells grow best in the full sun and well-drained soils and it can tolerate severe pruning during the winter. Winter pruning helps to shape the plant and encourage the development of new wood for additional flowers. Tecoma garrocha is in the bignonia family with about 725 mostly tropical species worldwide. Only four members occur in our region. A few well - known members include jacaranda, and trumpet vine. Quick Notes: Height: 10 - 20 feet tall, spread 8 to 12 feet. Flowers: Trumpet shaped, Yellow - Orange to orange, up to 2 inches long. Blooming Time: Late March to October. Leaves: Leaves are pinnately compound; 4 - 6 inches long, 3 1/2 inches wide, its leaflets are about 1 - 2 inches long; very glossy green serrated-edged, with lance-shaped leaflets. Found: Native of Argentina and Bolivia. Elevation: Native from 600 to 2,500 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: 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 Habitat: Alkaline, well-drained/light soils. An ideal xeriscape landscape plant in Arizona. Miscellaneous: Flowering Photos Taken March 15, 2006. Sun City, Arizona.