A berm is a small hill or shoulder used as a landscaping tool to create visual interest. Before planting anything, additional topsoil can be added to extend the length of the mound to create more natural curves in the landscape. Topsoil on the mound itself should be no more than 30 inches deep. Plants with large root systems should be planted a minimum of 20 feet from the edge of the mound. Elms, maples, poplars and other trees that seek water reservoirs should be planted at least 50 feet from the mound.
Trees have the longest root systems.
Shrubs can be planted at the base or on the slopes to frame the mound. Do not plant edible plants such as herbs or vegetables. Natural grasses are ideal for mound planting because their fibrous roots hold soil in place and provide year-round cover. Wildflowers and grasses are low maintenance and grow well in the dry soil on top of the mound. When working with vegetation on the mound, avoid tilling the soil too much and always wear gloves.