The team explore how garden plants are affected by differing weather conditions.
Carol Klein is at Pensthorpe Nature Reserve; Joe Swift visits Marqueyssac in the Dordogne.
Award winning designer Andy Sturgeon joins Monty Don to review the show gardens.
Monty Don shows which plants to choose for sensational borders right through the summer.
Rachel de Thame visits the Festival of Roses inspired by Alice in Wonderland.
Plant hunter Tom Hart Dyke invites viewers to enjoy his national collection of eucalyptus.
In a sneak preview of the show, Monty looks at this year's giant edible garden.
The team view spectacular show gardens and take part in a plant bring and buy.
Monty Don prepares to surround the courtyard garden with scented summer pots.
Monty Don prepares for the summer by sowing hardy annual seed directly into the soil.
Monty Don sows sweet peas and recommends what to plant for summer colour in the garden.
Monty Don, Carol Klein, Joe Swift and Rachel de Thame prepare for spring.