Moles burrow through the ground in search of food and to avoid predators. Sometimes, their burrowing adventures can wreck havoc on the roots of plants, causing many of these plants to die. Raising the garden bed can reduce the chances that this happens. Garden beds are nothing more than gardens where the soil is raised higher than the regular level of soil. While effective against many pests, moles can still sometimes get into the raised garden bed. Several different measures can be taken to protect the raised garden bed from the pesky moles.
Placing galvanized hardware cloth underneath the raised flower bed will keep moles out. The corners of the galvanized cloth should be cut so that it fits perfectly around the garden bed, according to Planet Natural. This cloth can usually be purchased from hardware stores.
Installing an irrigation system beneath the raised bed will not only continually provide the plants with moisture, but will also crowd out moles, according to Planet Natural. Drip irrigation systems are hoses that have holes in them that release tiny amounts of water for the plant roots.
A proactive approach to getting rid of moles includes trapping. These traps contain blocks that the mole will try to dig into, according to the University of California. Digging into these blocks will trigger the trap. Some traps capture the mole so that it can be released, while other traps are designed to kill the mole.
Placing repellents underneath the garden bed can discourage moles from coming near. Moles are repelled by broken glass, razor blades, bleach, mothballs, lye, castor oil and human hair, according to the University of California.
Moles can be discouraged from living in a particular area when their food sources are eliminated, according to the Internet Center for Wildlife Damage Management. Grubs are a major source of mole food and using parasitic nematodes or milky spore disease on the lawn can eliminate most of the grubs, which can discourage the moles from coming into the yard. Also, these grubs can damage the grass, so the lawn benefits overall from killing off the grubs.
Poisons are available that can be used to kill moles that might attack raised garden beds. Using bait to kill these moles is not effective because the moles mostly feed off of earthworms and grubs and are unlikely to eat any kind of bait left for them. The poison instead needs to be run alongside the tunnels. However, poisoning moles is cruel, might not get rid of all of the moles and can also unintentionally poison pets or children.