A good idea to keep from running out of food: let one really nice kale plant or collard plant mature and go to flower. The tiny seed pods can become fragile and shatter, losing you your seed, so keep an eye on them for the best time to harvest. The pods have been air dried, spread on a sheet, and pounded with a shovel. Here, the results have been poured off into a colander to sift the seeds into a bowl. From there they will go into an airtight container in the cold room. Kale seeds don't always keep well, so figure on using them next year, year after.