The story of how strawberries went from small forage item to one of the world’s most popular fruits – though they're technically not a true fruit – involves lots of crossbreeding experimentation, as you might expect, but also a bit of spy craft.
Research:

Behind the Scenes Minis: Carry-on Bags
28:38

Gustave Flaubert and the ‘Madame Bovary’ Trial
45:15

Elizabeth Bisland, Beyond the Trip Around the World
42:54