Overview
Garnish Island grows tree ferns from New Zealand and myrtle from Chile on what was, until 1910, a bare rock in Glengarriff Harbour. The trick is the Gulf Stream and a shelter-belt of pine: together they give this island off the Beara Peninsula in County Cork a mild, humid microclimate that keeps subtropical planting alive through an Irish winter. Locally it goes by Ilnacullin, and the OPW spells it Garinish. Alongside the exotics, rhododendrons and azaleas are at their best in May and June, and a long heather bank turns deep amber in autumn. You reach the island by boat from Glengarriff, and the boat is a separate charge from the garden.
Is Garnish Island open?
Not at the moment. The OPW lists the island as closed until 2027, and the 2026 season ended on 1 November. Check the OPW page for the next opening dates before you book transport. When the gardens are open, entry to the garden and the boat are charged separately, and Bryce House tours may be limited outside the busiest months.
History & The Bryce Vision
The island’s transformation began in 1910 when Belfast-born merchant and MP John Annan Bryce purchased the rugged, barren outcrop from the War Office. Bryce commissioned the celebrated architect-garden designer Harold Peto to reshape the rock into a formal, year-round garden. Between 1911 and 1914, more than a hundred workers moved soil by boat, blasted stone, laid winding paths, and erected the walled garden, clock tower, Italian casita, and the Martello tower that still crowns the highest point.
After Bryce’s death in 1923, his widow Violet continued to live on the island. From 1928, Scottish horticulturist Murdo Mackenzie took charge of the planting programme. Mackenzie established shelter-belts of Scots and Monterey pine to protect tender exotics from Atlantic gales, a crucial decision that secured the garden’s long-term success. He introduced many of the rare Southern Hemisphere specimens that now define the island’s landscape.
In 1953, Bryce’s son Roland bequeathed Garnish Island to the Irish nation. The Office of Public Works (OPW) has managed the site ever since, preserving both the horticultural legacy and the historic coastal defences. The Martello tower, originally built in 1805 during the Napoleonic Wars, is unusual among Irish examples for its straight cylindrical shape rather than the typical splayed base. Literary figures like George Bernard Shaw and George William Russell were frequent visitors, drawn by the island’s quiet seclusion and carefully composed views.
Garden Design & Key Features
If you only have time for one thing, make it the Italian garden: the colonnaded terrace, the reflecting pool and the casita are the composition Peto built the island around. Beyond that, his layout blends Italian formality with quieter Japanese touches. The Grecian Temple frames the Sugarloaf Mountain in a composition meant to echo Mount Fuji, while the small casita mirrors the simplicity of a traditional tea house. Throughout the grounds, dwarf trees are pruned in a bonsai style.
Key areas to explore:
- Happy Valley – A sunlit glade with a fine Chilean myrtle and a rhododendron display that peaks in May and June.
- Italian Garden – The colonnaded terrace, reflective pool, and casita form the visual and structural centre of the island.
- Exotic Collections – Giant tree ferns from New Zealand, dahlias, Japanese rhododendron yakushimanum, and a dense network of climbing vines.
- Heather Bank – An extensive sloping bank of heather that turns fiery in September and October.
The garden’s success relies on the microclimate created by the surrounding pine shelter-belt and the warming Gulf Stream, allowing species that would not survive elsewhere in Ireland to thrive.
The Ferry Experience & Wildlife
The journey to Garnish Island is part of the attraction, and the crossing is by boat from Glengarriff. The boat is not part of the OPW garden admission, so when the season reopens, check with the boat operator for the departure point, return sailings and access needs. Use marked paths on the island and follow the crew’s advice near the shore. The harbour is home to seabirds and waders, and swans, herons and shags are among the birds people look out for from the water. Wildlife sightings are never guaranteed.
Practical Information
Opening and admission The island is closed until 2027, and the 2026 season ended on 1 November. Check the OPW page for Ilnacullin for the next opening dates and current admission. Garden entry and the boat are charged separately.
Getting there The boat operator sets its own times and fares. Check the Blue Pool Ferry plan-your-visit page or the operator you plan to use before you travel.
Facilities and accessibility Access is limited for visitors with disabilities. The island’s paths are uneven, and historic steps and some structures lack wheelchair ramps or are not suited to wheelchairs. Keep dogs on a lead throughout the gardens, and check the boat operator’s pet policy before travelling.
Planning Your Visit
Allow around two hours on the island, and longer if you like to linger over the hidden nooks or a picnic on the lawns. Bryce House remains on site, with the family’s paintings, books and period furniture, though tours may be limited outside the busiest months. When the season reopens, an early start is the easiest way to avoid the crowds. The island’s carefully framed views are at their most striking in the late afternoon, when the light catches the Italian Garden’s reflective pool and the heather bank begins to glow.