The estate ( the castle 's land ) covers more than 14,000 acres ( 57 kmÂ ) . There are gardens and walking trails , as well as a farm which produces beef and a plantation ( planted forest ) which produces timber . The estate surrounding the castle covers more than 14,000 acres ( 57 kmÂ ) and , in addition to the garden containing lush gardens and walking trails , produces several cash crops including lumber and beef .