This week in Gardeners' Corner, David Maxwell has a masterclass with Averil Milligan on pruning a pear tree, Barbara Pilcher is busy in her greenhouse sowing seeds for spring and summer, Charles Dowding explains his theory on no-dig gardening and Helen Mark finds out what plans are in place in the small village of Ballyvoy by sowing a wildflower area and planting low-maintenance shrubs. Also in the programme a visit to Castle Espie as part of the Big Garden Birdwatch weekend.