City Botanic Gardens Australia Queensland Brisbane City City Botanic Gardens Australia Queensland Brisbane City City Botanic Gardens - The City Botanic Gardens are the city's oldest park, originally planted by convicts in 1825 with food crops to feed the prison colony. These gardens include ancient trees, rainforest glades and exotic species. They run the full length of Alice Street, bordered by Parliament House on the one side and the Brisbane River's northern banks on the other. They provide a lush green haven for city workers and visitors. There are free guided walks available from Monday to Saturdays at approximately 11.00 a.m. and 1.00 p.m. (excluding public holidays). The walks are at a gentle pace, last approximately one hour and are led by experienced friendly Volunteer Guides. Meet at the Rotunda near the Alice Street Main Entrance.