Each gardener designs and decorates at least one room.
The English Gardens and Gardeners trip by Smithsonian Study Tours explores past contributions of English gardeners as well as contemporary garden design and techniques.
Mrs. Clark is a professional gardener whose work frequently involves aspects of garden design.
So, with technical help from the Council on the Environment and Greenthumb, both city agencies, the gardeners designed a system to harvest rainwater from the roof of a four-story apartment house that borders the garden on the west, as well as from the roof of a one-story garage on the corner.
You can see for yourself in Richardson's new book, Avant Gardeners (Thames and Hudson, £24.95), which is devoted to what he calls "conceptualist" garden design.
The park, on the other side of Independence Avenue, includes a series of demonstration gardens, designed to tweak the imaginations of home gardeners.
As a landscape gardener, he designed two of the most celebrated Zen temple gardens in Japan: the Ryōan Temple garden, in Kyōto, an outstanding example of kare sansui, a dry landscape technique in which combinations of stones and sand are used to suggest mountains and water; and the Daisei-in garden, a miniature reproduction of a natural landscape, also in the kare sansui style.
And Rita, a magician gardener who designs with a lush and wild eye, filled the terraces with gorgeous plants.
In the early 18th century Queen Anne's gardener, Henry Wise, designed the grounds of the palace in the formal style of André Le Nôtre's famed gardens for Vaux-le-Vicomte and Versailles in France.
"It's the most ideal place to be quiet, private," said Sandra Kilminster, the longtime gardener who designed the grounds with the Harveys and was out working with a wheelbarrow and clippers one recent summer day.
