The answer to 'average cost of hedge' is that the typical range for hedge installation and maintenance can vary widely depending on several factors. Factors that affect the cost of hedges include the size and type of plants, the length and height of the hedge, the complexity of the installation, and your location.
Generally, you can expect to pay anywhere from a few hundred dollars for a small, simple hedge up to several thousand dollars for a large, complex hedge. Regular trimming and maintenance can also add ongoing costs of a few hundred dollars per year. To get an accurate estimate, it's best to get quotes from local landscaping professionals in your area.