In early spring, primroses and cowslips can be found in many gardens and parks. Their yellow flowers are certainly beautiful, but they also hold a secret: they come in two different types that can only mate with each other. In this episode we take a close look at several flowers – including a daffodil and a tulip – to remind ourselves what’s inside, before considering why plants bother to have sex at all. Why not look around your own garden to see if you have similar flowers and note down what you find, perhaps through a pencil drawing or by taking photos. Filmed in March 2020. Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales; http://creativecommons.org/licenses/by-nc-sa/2.0/uk/