There are many plants that can be used to block a neighbor's view. Some of the more popular choices include evergreens, such as arborvitae, spruce, and fir. Other options include deciduous trees and shrubs, like dogwood, viburnum, and rhododendron. When choosing plants for privacy, it is important to consider their mature size and growth habit. You will also want to make sure they are suitable for your climate zone and soil conditions.