Monty starts his plans for his revamped courtyard garden when he plants bare root trees and gives advice on climbers which will thrive on east-facing walls. Nick Bailey explores the strange world of lichens and finds out how these plants grow and thrive on trees, wood and stone, and Frances Tophill meets the enthusiastic gardeners of Barbados who fill their gardens, however small, with colour, foliage and world-class flowers. And as part of the programmes 50th anniversary, Flo Headlam reveals the plant she thinks has had the most impact on British gardens over the last half century.

Monty gives his advice on the best apples and pears to grow in small spaces when he begins to plant up his new fruit garden and gets on with planning for colour when he plants summer flowering bulbs. As April gets underway, Carol Klein chooses the humble primrose as her plant of the month, and we meet a couple from Yorkshire who have a passion for growing fruit and have filled their garden with over 100 fruit trees. And as part of the programme's 50th anniversary, Joe Swift makes the case for his Golden Jubilee plant, the one he thinks has had the most impact on British gardens over the last half century.