Saving turnip seeds is quite the commitment to self-sufficiency because turnips are biennial plants, which means that they go to seed in their second year of life. The turnips you eat (or pretend to eat or just nibble at to be polite) are in their first year of life. To save turnip seeds, you have to leave a couple of beautiful looking turnips in the ground overwinter, preferably intentionally rather than forgetting a turnip and discovering it again in the spring. Whoops! That’s certainly never happened to me!