Glenarm Castle Walled Garden Tea Room occupies the estate's former mushroom house, a low stone building built to cultivate mushrooms in cool, dark conditions and now used for daily service of tea, coffee and home baking. Glenarm Castle has been the family seat of the McDonnell family, Earls of Antrim, since the seventeenth century; the current owners, Randal and Aurora McDonnell, restored the walled garden, which dates to the 1820s and won the Historic Houses Garden of the Year award in 2023, the first Northern Ireland garden to do so. The kitchen uses Glenarm Shorthorn beef and organic salmon reared on the estate, alongside scones and cakes baked on site. Entry to the tea room is free; a small fee applies for the walled garden itself. Dogs are welcome in a designated outdoor area on a lead.
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