Your Cockatiels Health
I didn't see this on here already - But then again I didn't see the safe list at first either :o
Unsafe Plants
Harmful Plants (first source)
Amaryllis - bulbs
American Yew
Avocado
Azalea - leaves
Balsam Pear - seeds, outer rind of fruit
Baneberry - berries, root
Bird of Paradise - seeds...