Here are some great links on poisonous plants and substances (and other hazards):
- Toxic and Non-Toxic Plants @ The Budgie and Parakeet Place
- Gillian’s Help Desk – Toxicity of different plants/objects/ substances pet birds might eat or be fed.
- Toxic & Nontoxic Woods for Birds @ MD Vaden of Oregon
- Safe Plants for Birds @ Hot Spot For Birds
- Suggested Avian Landscape Plants @ Exotic Edibles
- Hazards FAQ @ UpAtSix