From winter floods to summer droughts, water is becoming ever-more of an issue for gardeners. This week, we talk to RHS Water Scientist Janet Manning, to discover clever ways we can all make the most of what we've got. The gardening advice team answers listeners' questions on plants that help prevent flooding, and those that tolerate both drought and waterlogging. Plus a look at the enduring legacy of pioneering plantswoman Beth Chatto's Dry Garden.