The garden was planted mostly in the 1930's and has an exceptional variety, not only of rhododendrons, but also of trees and shrubs including some exotic species from the southern hemisphere.The woodland garden covers some 20 acres.
The design takes full advantage of the natural features of the landscape with paths winding through hidden wooded valleys and up hills to reveal magnificent vistas toward and beyond the early Georgian House. There is a large pond and a stream running through the centre of the garden.
The more formal walled gardens surround Colonsay House which are filled with colourful mixed borders, climbing roses and clematis, and, more unusually, agapanthus.
The lighthouse garden's centrepiece is the lens from the Rhubhal lighthouse on Islay.
As the climate is mild, it is possible to grow a large variety of plants, including subtropical and more tender plants.There are eucalypts, myrtle, acacia, eucryphia and magnificent 50 feet tall magnolias dotted throughout the garden.
Apart from the rhododendrons, there is also a wide selection of shrubs including pieris, fuschia, hydrangea, olearia, escallonia and camellia.