In 1856, the estate became the home of the Gilliland family who has maintained and developed this landscape through six generations to the present day, including planting one of the finest arboretums in the Northwest of Ireland, specialising in its collection of conifers, rhododendrons, magnolias, and camellias.

Over the past 30 years, Brook Hall Estate & Gardens has led the way in researching and promoting energy, environmental, and landscape management strategies to succeed in true sustainability and inspire behavioural change, becoming the first farm in Northern Ireland to be measurably carbon positive.