In 1969, the Walled Garden of Logan Estate and some surrounding woodland became Logan Botanic Garden and joined Benmore Botanic Garden near Dunoon, Argyll (acquired in 1929) as a Regional Garden of the Royal Botanic Garden Edinburgh.
The Walled Garden is a breathtaking celebration of the world of plants. From spring to late autumn, a blaze of colour greets the eye and the air is heavy with exotic scents. With a backdrop of cabbage palms, Chusan palms and tree ferns, the atmosphere on a sunny day is truly tropical.
The Garden is enclosed by protective walls up to 4.5m (15ft) high, and is divided by a number of formal features into smaller gardens, each with its own character.
On the right, beyond the entrance to the Potting Shed Bistro and an archway leading to the Desert Border display, are boulder beds studded with many plants from New Zealand, including the legume Chordospartium stevensonii, severely threatened in the wild; and species of Aciphylla and Astelia.
The Rock Gulley has been replanted in 2009 with a range of exotic plants from around the world including Miscanthus floridulus and Miscanthus saccharinifolius. At the head of the Rock Gully is a carpet of the diminutive South American Gunnera magellanica part of the National Collection of Gunnera species held here at Logan.