Experts recommend trees be 20 feet apart. However, he said many people don't realize the trunks being a good distance away from each other isn't enough.
The space between branches needs to be at least 20 feet apart. Otherwise, fires can leap from one tree to the other, and without defensible space, a blaze can go from tree to home in seconds.
Mann also said homeowners can still have a good amount of trees, as long as they follow these rules. He talked about clumping or grouping trees together.
If you are interested in participating in the Wildland Fire Education and Prevention Program, go to http://www.3riversrcd.org/WFEP.htm for more details as to how to keep your home safe.