Cleome is just one of the many self-seeding annual plants that come back year after year without any effort on your part. Also called spiderflower because of the spider-like flowers, it grows 4 feet tall or better and brandishes large pink, purple or white flowers. Although it is a vigorous self-seeder, unwanted seedlings are easy to pull when they’re young. Because of its size, cleome is not a plant to be ignored. That size also makes it a great back-of-border plant in a flowerbed. Discover 10 wildflowers that do well in the city or suburbs.