Rita ...
A couple of years ago I talked my neighbors into working with me to have a CalFire crew come out and do some fuel reduction work on our properties. I learned about the "rule of four" from one of the crew.
I was surprised to find out that the blackberry patch growing up the seven foot cliff across the road was more of a fire danger to my house than any of the other things I was concerned about.
The owner of that property now keeps those blackberries cut back to nothing every year, so that we don't have to worry about them. They would have created 28' flames.
Smiles,
Lyn