sentences:  It includes an orchard, fruit and vegetable gardens, ornamental borders and a rose walk, as well as the national collection of tree quince ("Cydonia oblonga"), with 20 different varieties.Close to the walled garden is a Grade II listed ice house, probably dating from the 18th century, which is constructed in brick covered with a mound of earth.The entrance is surrounded by stone walls, from which a tunnel leads to a circular domed chamber.