When will we grow lettuce on the Moon?
21.08.2023 - 11:54
/ theunconventionalgardener.com
/ Emma Doughty
Growing lettuce on the Moon is a step closer, as a French start-up has successfully grown lettuce in simulated lunar soil.
Parisian urban agriculture start-up Agricool has grown salad in moon dust! The lettuce seen here is the result of a study developing solutions for urban agriculture.
CNES (Centre national d’études spatiales), the French space agency, asked Agricool to imagine a cultivation system for use on the Moon. The challenge was to produce nutritious vegetables using minimal resources – substrate, energy and space.
With that goal in mind, it makes sense to use local resources. But the Moon doesn’t have “soil” like Earth. Instead, fine rock dust, known as regolith, covers the lunar surface. And although we have samples brought back to Earth during the Apollo missions, they’re carefully preserved for research purposes and not available for growing plants!
For the moment, therefore, Earthlings exploring how to grow plants on the Moon have to make do with simulated regolith. For these experiments, Agricool used terrestrial basalt found in volcanic areas such as Auvergne.
“The chemical and physical properties of basalt are similar to those of lunar regolith.”
But volcanic rock isn’t the most fertile environment. So how do we make lunar soil a suitable environment for plants?
“The 1st tests were… catastrophic. When we added water, the regolith became as hard as cement. So we had to keep trying until we found the right solution.”
Agricool’s solution involves an innovative mix of regolith (which retains the water needed for plant growth) and a very low-density moss that provides oxygen in the root zone.
Seeds sown in this substrate are planted into small “pots” made of fibreglass. These keep the regolith in place but allow