Can I trim my neighbor's hedge that hangs into my yard?

Some states let you trim branches that cross onto your property, up to the property line. Some states and cities add limits. In some places, if you badly damage the plant, you can be held responsible for the loss. Local rules and homeowners association rules may also apply.

The easiest path is a friendly talk. Many neighbors will trim it themselves or agree to a plan. If you are not sure where the line is, a survey will show it. A hedge that sits on the line may belong to both of you.

Stay on the ground. Never climb or use a chainsaw from a ladder, and stay away from power lines. If the work is high or big, hire an insured tree service and ask them to work only from your side unless your neighbor agrees in writing.

This is general information, not legal advice. For a real dispute, ask a local attorney.