Glenarn is a private garden largely created and originally made famous for its collection of species rhododendrons by the Gibson family. Established in the 1920s and 30s the garden lies in a protected hollow with a steeply sloping glen running its length and providing shelter for large-leafed and tender rhododendrons. Early in the spring, tall Asiatic magnolias create dramatic interest while other plants such as crinodendrons, euchryphias and acers give colour at different times. A large rock garden built around the old quarry and natural rock outcrop provides a variety of habitats for smaller plants such as meconopsis, primulas, dwarf rhododendrons and many bulbs in season. The garden is open from March 21 to September 21 each year, dawn to dusk. Guided tours and catering are available for groups booked in advance. There are usually plants for sale including propagated rhododendrons.