Most pets enjoy playing and relaxing in the backyard. Sadly, time spent outdoors comes at a cost known as infestations of ticks and fleas. These parasites can also affect human beings and cause health problems, such as Lyme disease. Fortunately, you can grow certain plants in your backyard that are effective at keeping ticks away. Some of these additions to the backyard can also enhance the beauty of the garden. Rosemary The fragrant herb contains a naturally occurring compound called terpinolene that makes rosemary a natural tick repellent. The plant can also keep mites, flies, and aphids away. Pennyroyal Apart from beautifying your garden, Pennyroyals have a pungent odor that ticks and fleas detest. As a result, they will steer clear of the backyard. Wormwood Wormwood, also used as an ornamental plant, has a bitter taste which is known to repel disease-causing parasites. Rue Rue has a beautiful blue-green leaf structure and produces compounds hated by ticks. The plant’s leaves also serve as a strong disinfectant that can deter fleas when rubbed on a dog’s fur. Lavender The oil of lavender disturbs the olfactory sensors and makes it difficult for the blood-sucking parasite to find hosts. Citronella grass Citronella grass gives other plants a significant amount of cover in the backyard.