I have a land with some sloppy section. Neighbors have already filled they lands and my land needs some filling to level it. I have got a tree lopper to cut some big trees in the land and he suggested to leave the mulch for me to level that section. Looks like natural mulch will break down into small particles in 3-5 years. Looks like it wont' cause a termite issue. I am wondering if there is any down side of using mulch to fill the land? Thanks.