Plotlines: garden tour Dismiss Normal text size Tour Having been established in 1851, the Geelong Botanic Gardens are the fourth-oldest botanic gardens in Australia and they now have a suite of mature majestic trees to show for it. The gardens’ oldest trees, many of which are heritage-listed, will be the subject of a guided tour at 2pm on Sunday,May 9. Meet on the gardens’ front steps, gold-coin donation. friendsgbg.org.au Festival An avenue of giant red woods ( Sequoiadendron gianteum) in the Ballarat Botanic Gardens will be showcased as part of the Ballarat Heritage Festival, which runs for the month of May. There will be a guided tour of the avenue at 11am on Saturday,May 8 and there will be an exhibition that takes a more general look at these trees from California in the garden’s conservatory until May 30. ballaratheritagefestival.com.au