Plants: Safe / Toxic

"Safe and Poisonous Garden Plants"

Agriculture and Natural Resources, University of California

http://ucanr.edu/sites/poisonous_safe_plants

"Plants Toxic to Animals"

Agriculture and Natural Resources, University of California

http://ucanr.edu/sites/poisonous_safe_plants/Plant_Toxicity_Levels_523

PDF compilation of all of the above information:

http://ucanr.edu/sites/poisonous_safe_plants/files/154528.pdf

"ASPCA Guide to Pet-Safe Gardening"

http://www.aspca.org/pet-care/pet-care-tips/pet-safe-gardening.aspx

"Toxic and Non-Toxic Plants" - ASPCA

http://www.aspca.org/pet-care/poison-control/plants

"Know Your Plants" - California Poison Control System

http://www.calpoison.com/public/plants.html