When built in 1967 the 128 metre long main glasshouse range was regarded as the greatest innovation in glasshouse design in a century.
The then Curator of the Garden, Dr. E.E. Kemp insisted that there be no internal supporting structures impeding the growth of plants, thus allowing the maximum space and light inside.
Allan Pendreigh and GAH Pearce, architect with the Ministry of Public Works, achieved this using steel cables to suspend the main structure from a tetrahedral lattice framework.
Inside there are two levels with five climatic zones. They were filled with topsoil from the construction site of the Forth Road Bridge, being built at the same time.
One of the most popular plants is the Victoria amazonica (giant water lily), which grows in the ‘Plants & People’ house; its first flower bloomed in time for the official opening of the glasshouses by the late Princess Margaret, Countess of Snowdon.