Fill a spray bottle half full of vinegar and half with water. Shake the bottle to combine the ingredients and use this as a spray to get rid of fleas in your yard or garage. The strong smell may not be desirable for using as an interior spray, but for the yard it can drive fleas out. Fleas have a strong aversion to vinegar and spraying your yard thoroughly with this spray can reduce your flea population by the thousands, according to KillingDogFleas.com. Dropping a few crushed cloves of garlic into the spray bottle to mix with the vinegar and water can only increase the effectiveness of this home remedy, as fleas cannot stand the smell and taste of garlic either.
Buy diatomaceous earth (DE) at your local pool supply shop and use it as a complete yard treatment. DE is probably the best natural remedy for getting fleas out of your yard. The substance consists of crushed skeletal remains from organisms, sold in a powder form. DE is often used as a pool filter additive. The particles in DE, which have sharp edges that go unnoticed by pets and humans, actually make cuts into tiny insects such as fleas, causing them to leak water, dehydrate and die. This is a non-chemical treatment for your yard that is safe. Simply sprinkle this powder all over your yard to begin treatment, but do not inhale or ingest the DE as it may cause health problems.
The use of lime (calcium oxide) to kill fleas in your yard is an effective method, but there are other considerations. Sprinkle lime all over your yard to dry out fleas and kill them, but also realize that this substance can vastly affect the acidity of your lawn and soil. Plants (including your grass) may die if you use too much lime on your yard, and the acidity caused by the treatment may interfere with commercial pesticides if you decide to bring in a professional later, according to the Flea Control Guide.
Remember to treat your home before treating your lawn for fleas. Keep in mind that a flea killer or repellant on your lawn will cause fleas to run for their lives as soon as they suspect something is up. Many of them will run into neighboring lawns, but some may attempt to take cover in your house. Treating the interior of the home and all of your pets first is the best way to avoid this sudden invasion.