Starting with the World War I, the U.S. government was encouraging Americans to grow their own food to help relieve shortages. Originally known as the war garden movement, these so-called “victory gardens” made a reappearance in the 1940s during World War II.

And the idea of growing your own food is still popular — so popular, in fact, that Oregon State University has seen online enrollment for their Master Gardener Short Course Series jump by nearly a thousandfold.