How to feed your soil, special trees and Adam Frost's bulb of the month

As one season gives way to another, David travels to the County Meath garden of Paula Byrne. Twenty years ago, after building a new house, the interior designer turned her attention to the outdoors. Since then, she has created six unique gardens around her home, which attract many visitors during the summer months.In County Down, it’s been a bumper harvest for Helen’s Bay Organic after a warm summer. Founder John McCormick explains how they use cover crops to improve the life and fertility of the soil.Adam Frost chooses the diminutive Acis autumnalis as his bulb of the month for September, and Rosie Maye joins David in the studio to answer questions on bamboo and choosing a special tree to remember a precious uncle.Contact the programme at gardenerscorner@bbc.co.uk