The nursery is a «refuge» for a variety of endemic, rare and threatened species of the Greek flora, as well as for individual plants cultivated as replacements for any plant losses. Numerous species are kept here for protection as well.

This section of the Garden is also used for growing seeds or grafts for enrichment of the plant collection of the Garden.

Seeds are collected from many parts of Greece or exchanged through the seed banks of more than 300 Gardens globally.