5. Daffodil
Daffodil belongs to the Amaryllidaceae family. These are the plants that actually blossom in the garden without fear of the late spring drop. Daffodil plants contain a toxic chemical called lycorine. It’s a toxic chemical found in the plant’s bulb that can do the most damage to the body. Make sure don’t let your dog root around in garden beds where you grow daffodils.