I don't know really. But you may see https://www.daff.qld.gov.au/__data/assets/pdf_file/0009/57294/IPA-Leucaena-PSA.pdf on page 10. It states that the Spaniards spread the species widely and introduced it to the Philippines already after 1600. So it may have been in Colombia already for quite a long time, and possibly nobody quite remembers its introduction date.

Dear Angela Amarillo, Unfortunately I do not have this information, yet II would stronlgly suggest to have a look at the paper from Sergio Zarate (Economic Botany 51(3) pp.238-250.1997) and, in addition, to check documents and herbarium from José Celestino Mutis (1732-1808). Hope this could help a little, very best wishes

Giuseppe Brundu

The fast-growing, nitrogen-fixing tree/shrub Leucaena leucocephala, is cultivated as a fodder plant, for green manure, as a windbreak, for reforestation, as a biofuel crop etc. Leucaena has been widely introduced due to its beneficial qualities; it has become an aggressive invader in disturbed areas in many tropical and sub-tropical locations and is listed as one of the ‘100 of the World’s Worst Invasive Alien Species’

According to Global invasive species data base the species is native to Mexico and Central America. However based on global invasive species data there is no information available when the species was introduced in Colombia (the following information was extracted from the database related to Colombia)

Details of this species in Colombia

Status: Alien

Invasiveness: Not invasive

Occurrence: Reported

Source: Hughes, Dr. C.

Arrival Date:

Introduction:

Species Notes for this Location:

Management Notes for this Location:

Location Notes:

Last Modified: 15/08/2003 12:04:06 a.m.

Reference

http://www.issg.org/database/species/distribution_detail.asp?si=23&di=16059&sts=tss&lang=EN