As its title implies, this work concerns an examination of extensive ornamental gardening at three notable Highland estates. The Introduction sets the context for extensive gardening in Scotland by highlighting some eighteenth century perceptions of the 'English Garden' in Britain and in Europe before considering what, for some sections of the aristocracy, may well have been an acceptable approach to laying-out grounds in Scotland during the early part of the century. The first chapter outlines the contribution made by notable Scots to an age remembered for its significant advances in agriculture, architecture and the related arts. Chapter Two records the development of the grounds and gardens at Inveraray from the 1720's until the time of the third Duke of Argyll. The third and fourth chapters examine the development of the second Duke of Atholl's pleasure grounds at Blair and Dunkeld. Chapter Five outlines the evolution of the gardens and grounds at Taymouth from about 1720 until the later years of the third Earl of Breadalbane. The Epilogue provides a brief summary of the gardening achievements of these magnates and records the unexpected significance of exotic expression in their garden art.