Harmful Plants for cockatiels
99% of Indoor plants are poisonous to cockatiels.
If you think that your cockatiel may have ingested a potentially poisonous plant or substance, call your avian vet as soon as possible or better yet, just take your bird right away to the vet, as there is no time to waste.
Birds have a super fast metabolism and if your bird in fact has consumed any poisonous plant, you do not have much time left. As with any animal that you are caring for, whether is a cat, dog, or bird, always have handy the phone number of your preferred vet (avian in this case would be best), and an additional number of a 24 hour vet clinic that is closest to you, just in case you have a tragic incident after hours.