Whether or not that old packet of seeds will germinate is a question that often arises in gardening. But when the seeds in question have taken a trip to the International Space Station (ISS), the answer gets a bit more complicated. In 2015, a million rocket (AKA arugula) seeds blasted off to spend six months in space. When they returned to Earth in 2016 they faced an even larger challenge – they were to be sown by a horde of little fingers as the RHS Rocket Science experiment turned school children into space gardeners!