Good edging options include strawberries, especially the red- and yellow-fruited alpine varieties, which don't spread by runners. Chives and low-growing herbs, such as marjoram and thyme, also work well to finish off flower borders.
In general, choose varieties that keep on giving: broccolis that produce lots of side shoots, so you can cut a few at a time. With leafy greens, such as lettuce, spinach, kale, and chard, pick the largest leaves and allow the small ones to mature for later.
Shown: A stunning display of red leaf lettuce and red tulips.