My lawn is a blank canvas with the exception of two recently planted mature trees – Birch and Beech. I want to begin by planting a series of trees along the west facing perimeter of my garden. Site is exposed, I live in a limestone region and I love trees. Garden centre has recommended, Mountain Ash, Hornbeam, Hawthorn, Alder, Crabapple, and Whitebeam. Your advice as regards the above recommendations would be appreciated.