Rocket Falls to Earth?

It has been reported that a UK astronaut is advocating sending seeds of the rocket salad (I wonder if the name had any effect on this choice?) into space so that, on their return to Earth, they can be sent to large numbers of schools for children to determine whether the 'experience' had any effect on plant growth (http://www.bbc.co.uk/newsround/32801767). I'm sure that the intentions are educational and might well stimulate an interest in space science but the premise seems a little odd. It is well-established that plants growing under weightless conditions in space have difficulties with up and down but the pupils would be growing the seeds (along side 'regular' rocket seeds) under the full effects of gravity. I am uncertain what such a study might show (unless there is potential damage that results from travelling into space and back).