Overview: Jumping the Fence: Jerry is with an environmental weed expert in a patch of local Brisbane bush to take a look at plants that have escaped from home gardens. Wild Food: Costa meets a suburban forager who's passionate about edible plants in the wild. A Looming Threat: John visits John Arnott at the Royal Botanic Gardens Cranbourne to find out more about myrtle rust, a new fungal disease that could threaten a huge range of Australian plant species. Growing Health: Josh gets stuck into some spring work in his garden to ensure a healthy season, free of pests and disease. A Simple Solution: Sophie visits a lettuce farm to see how cleverly designed native planting has reduced pest and disease problems.