The Montagne de Richer lies within the garden's oldest section, which also now contains a systematic garden. The garden was expanded twice in the 19th century. Its orangery was designed by Claude-Mathieu Delagardette (1762–1805) and completed in 1804, the arboretum was landscaped in 1810, and the English Garden, with pool and greenhouse, dates from 1859. The monumental Martins greenhouse opened in 1860.
Today the garden contains about 2,680 plant species, including 500 native to the Mediterranean region. Of these roughly 2,000 species are grown outdoors, and 1,000 under glass. Major sections of the garden are as follows:
Greenhouse - 423 species in three rooms, including a tropical room with large central basin for aquatic plants, and two temperate rooms. Of interest are the collections of ferns, Bromeliaceae, and Orchidaceae, with good collections from French Guiana.