«Julia and Alexander Ν. Diomedes Botanic Garden» is an Institute of public benefit administered by a five-member board in which - according to Diomedes’ testament - the Rector of the University of Athens presides. The secretary of the board is the current professor of Botany at the University of Athens while the members are the President of the board of the National Bank of Greece, the President of the Supreme Court and the Director of the Management of National Legacies at the Hellenic Treasury.

The institute is financially self ruling having its income mainly from the investments of Diomedes’ property.