We were relieved to find out about this option because it gave our family a sense of perpetuity. When we described what we were doing to our friends at my wife's memorial many said they wanted to do that. We split my wife's ashes and did three urns. We set a small amount aside in a scattering urn for the close family to scatter in her beloved ocean. The rest we dived into two trees, one on the west coast and one on the east coast where her family and friends were split. We did a memorial ceremony with each. Both sites are magnificent. It was all too difficult to find a site that would allow this but we did. In the west coast it is a religious retreat (see below) and on the east coast a local cemetery that will provide perpetual care. (The larger cemeteries didn't know how to accommodate it ). our children especially enjoyed the thought of their mother would grow into a tree rather than just decay in the ground. We chose trees that would be strong and live long in the local environment. On the east coast we purchased several inexpensive ($600 ea) adjacent plots in a small town cemetery and chose a ginkgo biloba because they can live for many hundreds or thousands of years. Multiple urns can be added to the plots in the future. This is a brilliant idea. Much better than the way I buried my parents.