I Googled bury bourbon wedding and came up with lots. Apparently, it's a Southern custom.

We Catholics have a tradition of burying a statue of St. Joseph upside down in our garden if we want to sell our house. I was friends with a bunch of nuns who I thought were too sophisticated to believe in such nonsense, but they buried St. Joe in their garden and sold their convent, and moved to Chicago. Poof! No more convent. No more nuns. And they were such nice nuns, too. Such a shame.