Ladera Heights gardens may encounter common pests such as aphids, snails, slugs, whiteflies, and spider mites. These pests can cause damage to plants by feeding on their leaves or sap. To control them, you can use organic pest control methods like introducing beneficial insects, using insecticidal soaps or oils, or manually removing them. Some common diseases that can affect Ladera Heights gardens include powdery mildew, leaf spot, and root rot. Proper sanitation, regular inspection, and appropriate fungicidal treatments can help prevent and manage these diseases in your garden.