The sweet orange is a compact evergreen tree 20-30 ft (6.1-9.1 m) tall with a rounded, symmetrical crown spreading 15-20 ft (4.6-6.1 m) or so. The leaves are shiny and leathery, oblong to elliptic, up to 4 in (10.2 cm) long, and have narrow wings on their petioles (leaf stems). The twigs on many orange cultivars are thorny. Orange blossoms are white, very fragrant, and arranged in clusters of 1-6. They bloom in spring and give rise to oranges the following autumn or winter. Last year's oranges often are still on the trees when the new flowers are blooming. Orange trees are fairly drought tolerant, but fruit quantity and size may suffer if supplemental water is not given during prolonged dry periods. Annual rainfall totals of 40-45 in (102-114 cm) are adequate for orange trees. Orange trees cannot tolerate saturated soils.
Citrus sinensis - Floridata, http://www.floridata.com/Plants/Rutaceae/Citrus%20sinensis/647 (accessed January 24, 2017).