Question
what is the botanical name of the mexican fence post?

thank you
Al

Answer
Hello Al,
You are probably referring to the Pachycereus marginatus (scientific name). The official botanical name is Central Mexico Pipe Organ, but it is also called just plain Fence Post Cactus. Here is a link for more information about this cactus:http://davesgarden.com/guides/pf/go/62859/

Please ask me if you have more questions and I would be glad to help :)

Joan Avila