The seeds have been sent to the ISS as part of the charity’s Rocket Science project, launched by the RHS Campaign for School Gardening and the UK Space Agency.
The RHS is giving up to 10,000 schools the chance to grow these seeds in 2016 and compare them with seeds that have remained on Earth.
The seeds departed from Baikonur, Kazakhstan on Soyuz 44S - the flight that also delivered European Space Agency astronaut Andreas Mogensen and his crew to the ISS. The rocket and crew have docked and the seeds were unloaded and placed on board. They will remain on the ISS for several months and return to Earth with astronaut Scott Kelly, planned for March 2016.
See a YouTube launch video: https://www.youtube.com/watch?v=zDviRQtF8b8
Schools can apply for teaching resource packs containing the seeds atwww.rhs.org.uk/schoolgardening.