Georgadis worked as a landscaper whilst studying landscape architecture at the
University of New South Wales, where he developed an interest in sustainability. On 20 December 2011 the
ABC announced that Georgiadis would replace Stephen Ryan as the host of
Gardening Australia. In 2014, Georgiadis starred as 'Costa the Garden Gnome' in
Get Grubby TV on
ABC Kids. In 2021, Georgiadis was the host of a six part podcast called
Gardening Buds, which is featured in the ABC Kids Listen app. He also published ''Costa's World: Gardening for the soil, the soul and the suburbs.'' In 2023, he began hosting
Gardening Australia Junior on
ABC Kids. In 2024, Georgiadis was the subject chosen for
ABC Radio Brisbane's annual art competition The Bradley. In 2025 he appeared as a contestant on Claire Hooper's House Of Games. ==Awards and nominations==