There have long been scattered citron trees in the Cauca Valley of Colombia. After 5 years of study, horticulturists decided in 1964 that commercial culture could be profitable. Citron trees are not uncommon in some of the Pacific Islands but are rare in the Philippines. Tree small, spreading, thorny as 'Corsican'. The fruit is highly fragrant and is placed as an offering on temple altars.
Leaves are oblong and distinctly notched at the apex.
Foliage and fruit easily damaged by very intense heat and drought. Best citron locations are those where there are no extremes of temperature. The soils where the citron is grown vary considerably, but the tree requires good aeration. Propagation Citron trees are grown readily from cuttings taken from branches 2 to 4 years old and quickly buried deeply in soil without defoliation. For quicker growth, the citron may be budded onto rough lemon, grapefruit, sour orange or sweet orange but the fruits do not attain the size of those produced from cuttings, and the citron tends to overgrow the rootstock.