Moles are nature's rototillers they aerate the soil with their underground tunnels but folks who like a nicely manicured lawn may want to eradicate them.Identifying the problem
You can diagnose a molehill by its shape. Moles typically produce a volcano-shaped mound with a hole in the center (figure A). Were it gophers, the hole would be to one side and the dirt would be messed up.
One good thing about moles: They don't eat and destroy plants the way gophers do. In fact, the fluffy soil that moles create makes a great home for plant roots, but the mounds they produce as a result are a tad unsightly.
Addressing the problem: The heavy-handed method
One way to get rid of moles is to drown them out. To do so, insert a hose into one of the mounds (figure B). The adults will flee at the first sign of water. But if you're not up for killing baby animals, this method might not be for you baby moles won't figure out they need to flee until it's too late.
Equally barbaric are some of the traps available in stores (figure C).
Addressing the problem: Paul James' way
For the record, Gardening by the Yard host Paul James is a big fan of sniffing out, rather than snuffing out, moles.
There are various mole-repellent products at the ready. One is castor oil. Even though humans can't smell it, it drives moles crazy and sends them scurrying elsewhere. Saturate the ground by spraying the oil. The grubs that moles love to eat will get coated in oil and make a revolting mole meal.Castor oil also comes in a granular product. Paul prefers it because he thinks it works a little more effectively, is easier to spread and lasts longer. It also deters voles, gophers and armadillos.
Another repellant: a mixture of bobcat and coyote urine. To use it, saturate areas where you see visible signs of moles. (And make sure to concentrate the spray on the ground, avoiding plants.)