Don't be deceived by its sweet appearance, the demure-looking oleander is downright deadly. The plant's fragrant blooms make it a favorite for gardens in subtropical locales. while its toxic leaves, flowers, and branches make it resistant to hungry deer. If you choose to cultivate oleander, you won't need to worry about pests but you'll need to keep the plant out of reach of small children and pets instead. Available on Amazon; $4.99.