A few weeks ago, a guest lecturer in my Urban Forestry class sited a survey that found a link between childhood environment and the preference towards the type of tree the person would tend to plant in their front yard. the correlations were pretty strong, and the basic idea was that people tend to show a bias for the types of trees that may have grown up under, in and around.
So people from the mountians showed a bias toward pines, folks from the east coast to deciduous hardwoods and folks from the west coast, redwoods, firs and the like.