Sophie Thomson explores the origins of Adelaide's free food carts; Costa Georgiadis meets fresh food fan Dr Sandro Demaio from ABC's Ask The Doctor, and Josh Byrne visits the Perth garden of author Deryn Thorpe.

In our Stargazing special, Jerry Coleby-Williams explores what's happening in his garden at night; Millie Ross builds a box to welcome microbats; and Josh Byrne builds some covers to keep cats off his vegie patch at night.