Costa Georgiadis builds a new garden bed, Sophie Thompson meets a Philodendron fanatic, Tino Carnevale demonstrates different ways to support plants, and guest presenter Luke Mitchell shows how to care for secateurs.
The judges are looking for just five more cooks to round out the top 24. The home cooks who are given a second chance will battle it out for the remaining aprons.
All eight teams are playing for immunity from the elimination build. They are asked to create a beautiful castle that will spectacularly explode as a bowling ball is hurled at it.