Carol Klein will visit the restored vegetable garden at Knightshayes Court in Devon.
There will also be a feature on natural swimming ponds with Alys Fowler.
Toby Buckland will build a path out of recycled materials in this hour-long programme.
Klein continues her investigation into plant families at Glebe Cottage as she delves into the members of the Campanula family, from Bell Flowers to Lobelia.
Joe Swift will be in his sustainable back garden at Greenacre and will show how to make a simple bench from a reclaimed pallet.