Subantarctic Plant House: Peter Cundall is at the Royal Tasmanian Botanical Gardens, looking at plants that grow in the subantarctic, including ferns, Macquarie Island cabbages, bog plants and lichens. Biological Pest Control: Sophie Thomson visits an insectary at Loxton in South Australia that breeds beneficial insects for use in the home garden. Tips and Tricks: Jane Edmanson shows us how to deal with citrus gall, a lumpy looking infestation caused by the citrus gall wasp. Rosemary: Colin Campbell shows us the many varieties of rosemary and explains how to grow and care for them. Pruning Guava Trees: Peter Cundall shows us the techniques to prune guava trees for successful fruiting. A Parkland Garden: Angus Stewart visits a garden set on 2 hectares in Galston, NSW, which has been transformed over 30 years from a weed infested block into an extraordinary botanic-like garden boasting a unique range of plants.