Just when you're starting to get nostalgic for midsummer, these flowers put on a season finale. They like cold stratification, so it's ideal to direct sow them in the fall or early spring. With the exception of poppies, which don't like to be transplanted, you can also sow these varieties in pots which you leave outdoors, and then transplant them into prepared beds when the seedlings are big enough. Alternatively, many of these can be started indoors in later spring if you sow into pots then put into the refrigerator for several weeks.