When I was at school all we ever grew was cress.
Tim Peake is asking thousands of schoolchildren to grow rocket seeds that spent six months in space. The kids have been thinking about how the seeds of the salad leaf might grow differently. They'll test their theories by growing some non-space rocket as well as the space seeds.
For long-haul space travel to be a reality we need to be able to grow food in space. It's exciting that schools in the UK will help advance scientific knowledge about how plants react to space travel.