Sir Henry Seton Steuart was a landowner and agriculturalist. The family seat was Allanton, Lanarkshire, Scotland. Between 1788 and 1805, Sir Henry had the park at Allanton laid out by Thomas White the elder.
Sir Henry was very interested in arboriculture, and invented a succesful system for transplanting mature trees using a wheeled cradle. He was responsible for much of the tree-planting on his estate.