I want to become a landscape architect?

I already hold a BA in psychology and an MS in Counseling. I'm switching fields so I don't know if I should go back and get another bachelors in landscape architecture or try to pursue a 3-year masters (MLA) degree? Would I be more successful getting a BA in landscape architecture or get just as much out of an MLA which is tailored for those who already hold a degree in a different field.