Jerry Coleby-Williams explores Cairns Botanic Gardens, Millie Ross shows how to harness the growing power of smoke, Jane Edmanson visits a tiny but terrific courtyard, and Costa Georgiadis holds a masterclass on worms.

Costa visits an apartment dweller whose new garden hobby is growing, Clarence explores a botanic garden run by volunteers, Jerry meets scientists hunting hardy wild taro, and Millie suggests natives for tough garden spots.