This week, Gardeners' World is all about pots! Monty Don takes a look at the use of pots and containers and revels in their versatility, practicality and potential, and shows us how best to use them in our own gardens. Carol Klein returns to Stroud to see how the new gardeners are progressing and helps them select the perfect plant combinations for containers on their shady patio. And we meet blogger and writer Niki Preston, who reveals how gardening using containers changed her life.