Rosemary. Rosemary is an earthy smelling evergreen herb bush that deters a number of annoying bugs and insects. Besides having the power to chase away mosquitoes and flies, rosemary is good at repelling fleas and ticks from the area it is planted in.Click to see full answer. Similarly, it is asked, does Rosemary keep fleas away?Rosemary is a great organic flea control product. It can be used to treat light infestations as well as on pets (depending on how you use it). Note: Rosemary is a natural flea repellent, it will not get rid of fleas but help repel and prevent them.Beside above, how do you use rosemary oil for fleas? Make a pleasant smelling and effective flea repellent spray for by steeping thinly sliced lemons and sprigs of rosemary overnight in near boiling water. Add a few drops of geranium essential oil. Spritz on soft furniture, bedding and even the dog to repel fleas. Also to know is, what herbs keep ticks away? You can help deter ticks and other pests in your backyard by planting these fragrant anti-tick plants, which also help keep other pests at bay. Garlic. Planting garlic in your garden helps keep many pests away, including ticks and fleas. Mint. Rosemary. Rue. Wormwood. Fleabane Daisy. Chrysanthemums. Pennyroyal. What herbs do fleas hate?Tansy, Wormwood, Eucalyptus, Fleawort, Pennyroyal (also called Fleabane), Rue, Citronella and Sweet Bay are garden plants that can help repel fleas and they are suggested for use as natural flea control, but all of them are toxic to dogs and cats.