Houseplants and garden plants send a lot of pets to the vet. Here is the quick reference — what is deadly, what just irritates, and what is genuinely safe. Tap any plant for the full guide.
If you remember nothing else: true lilies are deadly to cats (even the pollen), sago palms cause liver failure in dogs and cats, and oleander can stop the heart. For all of these, call a vet immediately rather than wait. Many other common plants — pothos, philodendron, peace lily, dieffenbachia — mainly cause painful mouth irritation that is unpleasant but rarely fatal. When buying plants for a home with pets, check the label against a pet-safe list, hang trailing plants out of reach, and keep flower bulbs away from digging dogs. For greenery you never have to worry about, the spider plant is a reliably safe choice.
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General information, not veterinary advice. When in doubt, treat any ingestion as potentially serious. Full disclaimer.