Hortus conclusus is a Latin term, meaning literally "enclosed garden". Both words in hortus conclusus refer linguistically to enclosure. It describes a type of garden that was enclosed as a practical concern, a major theme in the history of gardening, where walled gardens were and are common. The garden room is a similar feature, usually less fully enclosed.

The early history of gardening is largely entangled with the history of agriculture, with gardens that were mainly ornamental generally the preserve of the elite until quite recent times. Smaller gardens generally had being a kitchen garden as their first priority, as is still often the case.