The Gardens as they exist today were largely created by Lord Milo Talbot in the years 1948 to 1973 and cover an area of over 8 ha - 6.5 ha of shrubbery and 1.5 ha of Walled Gardens.
An emphasis has been placed on the cultivation of plants from the Southern Hemisphere - many species and varieties collected by Lord Talbot. Genera which are particularly well represented are Olearia, Azara, Escallonia, Pittosporum, Syringa, Hypericum, Clematis, Euphorbia, Nothofagus, Salvia and Berberis.
The collection continues to be expanded with the addition of new species and varieties. Seed exchange has been resumed and many additional semi-tender species have been planted
In the Talbot Botanic gardens,situated within Malahide Castle Demesne and containing almost 5,000 species,emphasis has been placed on Southern Hemisphere plants, particularly Australasian and Chilean species.