Most greens will bolt in summer after a couple of weeks. If you carefully select the seeds and keep them in paper bags, you can then sew a few at a time, and continue to snip and eat all the greens you want, all tender and young.
Left over seeds?
Sprinkle them on your salads, add them to your vinaigrette, spread them on sandwiches.
Seeds, tender leaves, they will delight your palate and your pocketbook.