It's snowing in Toronto this morning. Seriously. But irrespective of what I see outside my window, I know spring to be near at hand. Many of us have experienced the therapeutic power of caring for and raising plants and are looking forward to getting out into our gardens. I for one need to have some greenery around my office and home, which marks me as a bit unusual. In space, however, plants may eventually serve a more vital role. This week Alex examines the first green shoots researchers are cultivating along that pathway. Above, a zucchini plant is pictured on the ISS.
by Alex Innanen
Spring is arriving in fits and starts in Toronto, and that means it’s time to start this year’s seeds and get out in the garden. It would also normally be time to visit a nursery (or five) but this year is a bit different, and my gardening routine has been disrupted by isolation. Which got me thinking about growing plants in an even more isolated location – that’s right, it’s time for space plants!
I know that taking care of my plants, spending time in the garden, can be very relaxing and grounding. The same is true for astronauts. But we haven’t been growing plants in space just because they’re nice to work with. One big reason to grow plants in space is for food. On the ISS, it’s relatively simple to resupply the astronauts with fresh food but think back to early explorers spending months at sea and getting scurvy. If only they had had a grow light and some arugula! Plants have also been suggested as a from of life support – we know that plants recycle carbon dioxide into oxygen, the kind of reverse of what happens in animals where we breathe in oxygen and exhale carbon dioxide. In addition, wastewater can be used to grow plants, and the same plants then transpire, or release, clean water vapour, which can be condensed and used again.