These plants can kill your pets. Perhaps the most deadly plant you may already have in your yard is the Sago palm/Cycas revoluta. It is toxic to humans and pets.

Common houseplants, such as philodendron and aloe vera, can be toxic to cats and dogs. Pets may experience irritation, swelling, vomiting, or diarrhea after ingesting these plants.

Mistletoe: All parts of this plant are poisonous to pets and humans. Amaryllis: All parts of the plant are toxic to plants, but toxins are more concentrated in the bulb.

These plants can kill your pets. Perhaps the most deadly plant you may already have in your yard is the Sago palm/Cycas revoluta. It is toxic to humans and pets.