When designing street scapes, Boulevard plantings or landscapes that border driveways and sidewalks a consideration factor is snow/ice and the control method that will be used. Many of these areas will receive a dose of de-icing salts in the northern climates. Salt damage can show up through aerial spray or build up in the soil over time through direct contact or runoff.
Other then careful plant selection there are a few ways to control salt effects in the landscape including little to no use of de-icing salts, spread salt after shoveling, is salt with sand, alter drainage patterns and use temporary barriers to protect plants.
Some of the best plants with resistant characteristics include: Serviceberries, Honeylocust, white oaks, Japanese tree lilacs, Junipers, forsythias, hydrangeas and sumacs. Colorful perennials like daylilies, beebalms, sedums and Karl Foerster Feather Reed Grass will add allseason interest to your mailbox planting. Be more careful with: maples, river birch, crabapples, arborvitae, boxwoods and viburnums.