Houseplants are actually more of a problem for cats as opposed to canines. TIP: Consider safe alternatives such as artificial arrangements made from silk.
Lilly’s are lovely but many varieties, including Tiger, Asian, Japanese Show, Stargazer and Casa Blanca can cause Kidney failure in Cats.
Poinsettias are often talked about, but are very overrated with respect to being toxic to pets. At worst they can cause an upset stomach.
Mistletoe: The berries are very toxic. Stomach upset and fatal heart problems may develop in dogs and cats if they ingest the berries.
Holly and English Ivy may cause vomiting, diarrhea nausea and lethargy
Amaryllis can cause vomiting and diarrhea
Hibiscus can cause diarrhea