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Murlough Nature Reserve is owned by the National Trust. Chris Packham meets David Thompson to look for wildflowers and other plants. As a typical heathland it is very dry here. The east of Ireland gets less rain and this area is almost like a desert for the plants. It is so dry that something extraordinary grows here - a lichen completely carpets the ground in places. You'd expect to see lichen on mountainsides and tombstones, so why is it here? The lichen can take advantage of extreme conditions that plants can't tolerate - its sites are hot and dry in the summer months and frosty in the winter. It is an opportunist. Lichen is not a plant, but a mix of fungus and plant.