Perennial systems should be a cornerstone of your survival plan. At the site below they have a 110 page FREE book with the title of this post. Granted this is for the midwest but your local University might have something similar.

http://www.savannainstitute.org/


If you don't want to give out your email you can access the pdf at this link:

https://drive.google.com/file/d/1UTW...boiGCzX3n/view