Raul Feliciano,CLM, is a landscape pro in Puerto Rico that knows his stuff. A college graduate, he has a certificate in Commercial Horticulture/Landscape Management from the NY Botanical Garden.
He's also the author of the only blog on his lovely island that's devoted to horticulture. (At least the only one we're aware of, that is.)
While it's been 40 years since I spent a year studying and teaching English in Bogota, Colombia, and my Castellano is admittedly weak, I could still understand enough of Feliciano's Spanish-language blog to recommend it to your Spanish-speaking workers. I think they would enjoy it and learn something too.
If the link above doesn't work (click on the headline), here's the url for the blog — endemismotrasnochado.blogspot.com. I know that works because I've tried it a couple of times.
— Ron Hall