The hardback with 200 new photos costs $55.
The book "offers insight into the pivotal role the institution plays in encouraging diversity and engages in a deeper dialogue about global climate factors that impact this venerable landmark".
Long is CEO at the garden since 1989. Forrest is vice president for horticulture.
Archival and contemporary photographs document the garden’s history and its ongoing development alongside essays that describe the origins and purpose of a botanical garden and provide a look at the 250 acre garden’s scientific discoveries since its founding in 1891.
Meanwhile, Merrell is to publish Luciano Giubbilei's The Art of Making Gardens, a £45 hardback. Foreword is by Sir Paul Smith and introduction by Fergus Garrett.