Flowering plants and leafy vines are a great way to add a pop of colour and natural beauty to your indoor and outdoor space, but there's one thing to consider when deciding what to plant: some plants and flowers are poisonous. There are plant varieties that contain toxins which are harmful, and potentially even fatal, to both humans and animals. While there are blooms that have vibrant hues, unique petals, and delightful scents, don't let that fool you, these plants may still be poisonous.