Below are some links to give you a general idea as you will see it varies.
It is my understanding that in some states NOT CA though.you can almost buy a degree for $250.
LANDSCAPE ARCHITECTURE COURSES
Cal Poly, San Luis Obispo, CA
http://www.calpoly.edu/~wbremer/lacourses.html
http://www.temple.edu/ambler/la-hort/lacourses.htm
http://www.depts.ttu.edu/officialpublications/courses/LARC.html
http://www.msstate.edu/dept/LA/policies.htm
Admissions Requirements
http://www.uta.edu/gradcatalog/2002/landscape.php#admreq
Home Page
http://www.uta.edu/gradcatalog/2002/landscape.php
http://hla.colostate.edu/courses/la_courses.htm
http://www.csupomona.edu/~la/grad/courses.html
FAQ's
http://www.cob.calpoly.edu/gradProgram/faq.html
Good Luck! Former resident SLO
2102 Broad Street.