I believe this is also called "Snowball Sand Verbena". It grows wild around here but is apparently popular in some western rock gardens. As the scientific name abronia fragrans implies, it is very fragrant, especially at night. There is some along where I sometimes walk my dog at night and you can easily pick up the scent from 30 feet or more. I just ordered some seeds to try and get it growing in my yard. It is hard to propagate I believe.